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Dual CDMA sims?

I was curious if anyone had tried dual CDMA carriers on their dual sim G4s. My understanding is that for 3G cdma voice the device itself is registered as opposed to a 3G GSM which registers the sim, so only one CDMA service could be active at a time. Changing to another CDMA carrier would mean going through Verizon's or Sprints's activation process each time you wanted to change to a different sim (this was my experience with a 3 sim adapter). I'd love to hear someone more knowledgeable chime in on this subject and provide some feedback on whether or not this is how it would work with a dual sim moto G4.
I'd love to have dual CDMA sims because I have free service with ringplus (Sprint MVNO) but it's spotty in rural areas, whereas Verizon has the most solid signal in the remotest regions.....however I think it's a pipedream. I am aware that you can do a CDMA LTE sim switch and get data without a problem (I'v done this with a triple sim adapter), it's voice and text that I'm interested in being able to switch to, without having to go through the activation process. And because I need this voice and data in remote areas without LTE, VOLTE isn't an option.
I hope that isn't too convoluted or arcane a question, I realize it's not a common scenario. But with the Moto 4G being carrier friendly to all the north american providers (GSM and CDMA) and having a dual sim slot, it's the first plausible solution to what I'd like to achieve.

Unfortunately, the only G4 models that have CDMA are the US models (XT1644 G4+, XT1625 G4, XT1607 G4 Play, XT1609 G4 Play for Verizon Prepaid), and the US models are only available in single-SIM format.
From what I've been gathering, there are no dual-SIM CDMA phones that fully work with US carriers available yet. The OnePlus 3 comes sorta close, it's dual-SIM and has CDMA Band 0, which Verizon uses in most markets, but at the moment it either works in 1x/EVDO mode for calls/text, or LTE mode for data. However, it's lacking CDMA Band 1 (Verizon & Sprint) and CDMA Band 10 (Sprint), so it's not ideal. It's also lacking Verizon's main LTE Band 13, and all of Sprint's LTE bands.
Slightly good news, though. The upcoming ZTE Axon 7 is dual-SIM and FCC testing indicates that it fully supports all US carriers, including all Verizon and Sprint CDMA bands.

xtermmin said:
Unfortunately, the only G4 models that have CDMA are the US models (XT1644 G4+, XT1625 G4, XT1607 G4 Play, XT1609 G4 Play for Verizon Prepaid), and the US models are only available in single-SIM format.
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Ah, that's unfortunate.
xtermmin said:
The OnePlus 3 comes sorta close,
Slightly good news, though. The upcoming ZTE Axon 7 is dual-SIM and FCC testing indicates that it fully supports all US carriers, including all Verizon and Sprint CDMA bands.
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I'll keep an eye on it.
Would the concept work the way I described in the first post though? I'm really curious if the phone would require sprint or verizon activation when switching cdma sims. I don't have a great deal of experience, simply my results with a multisim adapter. I was unable to test the adapter with a verizon and sprint capable phone (like a nexus 6) but tested it with an Verizon samsung s5 using gsm sims and a verizon LTE sim. The gsm sims (various at&t and t-mobile MVNO) were of course no problem, but switching to (or back to) a verizon LTE sim required teh verizon activation process (but not for data, as the LTE was active without activation).
Is it possible to have a dual sim (or even single sim) phone that supports both carriers (Verizon and Sprint) that could switch back and forth, or is the activation process simply inherreient with the way the devices imei's are registered on CDMA networks, and will always be required. For me going through the activation process for Verizon or Sprint when switching sims would simply preclude any practical usefulness with a dual sim cdma capable phone (although it would still have value as a dual sim with a cdma and a gsm sim).
Sorry for the late reply xtermmin and thanks for the info.

devinpatterson said:
Would the concept work the way I described in the first post though? I'm really curious if the phone would require sprint or verizon activation when switching cdma sims. I don't have a great deal of experience, simply my results with a multisim adapter. I was unable to test the adapter with a verizon and sprint capable phone (like a nexus 6) but tested it with an Verizon samsung s5 using gsm sims and a verizon LTE sim. The gsm sims (various at&t and t-mobile MVNO) were of course no problem, but switching to (or back to) a verizon LTE sim required teh verizon activation process (but not for data, as the LTE was active without activation).
Is it possible to have a dual sim (or even single sim) phone that supports both carriers (Verizon and Sprint) that could switch back and forth, or is the activation process simply inherreient with the way the devices imei's are registered on CDMA networks, and will always be required. For me going through the activation process for Verizon or Sprint when switching sims would simply preclude any practical usefulness with a dual sim cdma capable phone (although it would still have value as a dual sim with a cdma and a gsm sim).
Sorry for the late reply xtermmin and thanks for the info.
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I can't speak for Sprint, as I have Verizon, but I do know that they're more restrictive than Verizon.
On Verizon, the only current restriction is a whitelist when you try to activate a SIM for the first time. You have to use a device that's in Verizon's "activation database", typically Verizon-branded devices, iPhones 6 and up, the Moto X Pure, and (at some point, if not now) the Moto G4 lineup. Once you have an activated SIM, you can stick it into any compatible device (be it from Verizon, another provider's phone, or even an unlocked phone that doesn't officially work on Verizon) and you should be good to go.
For example, I've been using my same Verizon SIM that I got with the HTC Thunderbolt (when it launched in March 2011) in numerous other phones (Verizon phones, US Cellular phones, unlocked phones, even some GSM/LTE-only phones) with no need to contact Verizon or use the website or anything. I've been able to just pop in the SIM, adjust the connection method on the phone if needed, and go.
As for your experience with using a dual-SIM adapter on the Verizon GS5, it might be due to the phone going into "GSM/LTE" mode when you insert a ATT/TMO SIM, but not switching to "CDMA/LTE" mode when you switch to your Verizon SIM (thereby only connecting in LTE mode). Might want to try setting it to Global mode (GSM/CDMA/LTE). The Verizon version probably wasn't tested for dual-SIM use, so it might just be the OS not knowing to switch to the other mode, or it might be an issue with the adapter itself.
Regarding an actual dual-SIM device with both SIMs being CDMA, I'm unsure if it causes any issues, as there's been no phone with that ability released yet (technically, someone can try dual Verizon SIMs in the OP3, but the CDMA implementation on that phone looks to be pretty half-assed, so I wouldn't use it as a baseline). Guess it depends on how the SIM slots are setup (if they share the same IMEI, or if they have different IMEIs for the two slots). If they're the same IMEI, I can see there potentially being issues, but if they're different (which should be the case for any modern name-brand flagship), there shouldn't be.
We'll know more once the Axon 7 releases. Unfortunately, ZTE has said that CDMA support will be coming in a software update later, but at least the phone is physically banded for CDMA, so we won't know for sure until then.

Actually the xt1644 have dual sim slots , one is hidden open the phone and you will find it

How to enable GSM on GS7 (Smg930v)?

Hi,
I've found someone in Brazil who is selling a Verizon GS7 (smg930v) at a great price but he claims that it's not working here because it won't recognize the Brazilian mobile network (the bought the phone in the US). He says the phone connects to the 4G network but he is not able to navigate or make phone calls. I find this weird as I've read in many places that Verizon's GS7 are unlocked to work on GSM.
Any thoughts on what can be done?

rawfa said:
Hi,
I've found someone in Brazil who is selling a Verizon GS7 (smg930v) at a great price but he claims that it's not working here because it won't recognize the Brazilian mobile network (the bought the phone in the US). He says the phone connects to the 4G network but he is not able to navigate or make phone calls. I find this weird as I've read in many places that Verizon's GS7 are unlocked to work on GSM.
Any thoughts on what can be done?
Click to expand...
Click to collapse
It won't connect in Brazil because they are GSM-only; whereas VZW is a CDMA-only network. South America is like the EU - mostly,l if not entirely, GSM-only; VZW and Sprint are using different (and not cross-compatible) types of CDMA. Tracfone (and their Safelink lifeline division) is an MVNO that uses T-Mobile and VZW towers for coverage (and thus support both GSM and CDMA phones). Tracfone has both GSM and CDMA SIM kits - however, the SIM kit you purchase must match the target phone. (Some phones, such as the Galaxy Nexus, for example, are available in both sorts - maguro for AT&T Mobility and T-Mobile/Deutsch Telekom, and toro/toroplus for VZW and Sprint; there are even "unified" ROMs (the Tuna versions are neutral in this fashion, and are available from JB to N - PureNexus 7.1.1 for Tuna is my default, and is just one such example). It may be possible to modify the radios to support GSM bands; however, I would not recommend it.

rawfa said:
Hi,
I've found someone in Brazil who is selling a Verizon GS7 (smg930v) at a great price but he claims that it's not working here because it won't recognize the Brazilian mobile network (the bought the phone in the US). He says the phone connects to the 4G network but he is not able to navigate or make phone calls. I find this weird as I've read in many places that Verizon's GS7 are unlocked to work on GSM.
Any thoughts on what can be done?
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Click to collapse
the phone is gsm unlocked out of the box
my s7 is Verizon on att
flash the unlocked firmware to further unlock all the bands but Verizon unlocks out of the box
---------- Post added at 07:49 AM ---------- Previous post was at 07:47 AM ----------
PGHammer said:
It won't connect in Brazil because they are GSM-only; whereas VZW is a CDMA-only network. South America is like the EU - mostly,l if not entirely, GSM-only; VZW and Sprint are using different (and not cross-compatible) types of CDMA. Tracfone (and their Safelink lifeline division) is an MVNO that uses T-Mobile and VZW towers for coverage (and thus support both GSM and CDMA phones). Tracfone has both GSM and CDMA SIM kits - however, the SIM kit you purchase must match the target phone. (Some phones, such as the Galaxy Nexus, for example, are available in both sorts - maguro for AT&T Mobility and T-Mobile/Deutsch Telekom, and toro/toroplus for VZW and Sprint; there are even "unified" ROMs (the Tuna versions are neutral in this fashion, and are available from JB to N - PureNexus 7.1.1 for Tuna is my default, and is just one such example). It may be possible to modify the radios to support GSM bands; however, I would not recommend it.
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you do know that almost all Verizon phones now are unlocked out of the box no mods needed
the reason is some of the bands that gsm carriers are not supported by verzion
mine is a Verizon on att rite now no mods at all other than root and stuff
---------- Post added at 07:52 AM ---------- Previous post was at 07:49 AM ----------
rawfa said:
Hi,
I've found someone in Brazil who is selling a Verizon GS7 (smg930v) at a great price but he claims that it's not working here because it won't recognize the Brazilian mobile network (the bought the phone in the US). He says the phone connects to the 4G network but he is not able to navigate or make phone calls. I find this weird as I've read in many places that Verizon's GS7 are unlocked to work on GSM.
Any thoughts on what can be done?
Click to expand...
Click to collapse
sorry for double posting kinda thing here
the reason its connecting to 4g there is the phone supports the 4g band obviously in brazil
but not some of the others I had this issue with my note 5 not supporting atts 4g band so I would get 2g and 3g but no 4g
again flash the g930u firmware and it seems to unlock all the bands
---------- Post added at 08:06 AM ---------- Previous post was at 07:52 AM ----------
rawfa said:
Hi,
I've found someone in Brazil who is selling a Verizon GS7 (smg930v) at a great price but he claims that it's not working here because it won't recognize the Brazilian mobile network (the bought the phone in the US). He says the phone connects to the 4G network but he is not able to navigate or make phone calls. I find this weird as I've read in many places that Verizon's GS7 are unlocked to work on GSM.
Any thoughts on what can be done?
Click to expand...
Click to collapse
u might try in mobile networks to switch it to global instead of anything else

rawfa said:
Hi,
I've found someone in Brazil who is selling a Verizon GS7 (smg930v) at a great price but he claims that it's not working here because it won't recognize the Brazilian mobile network (the bought the phone in the US). He says the phone connects to the 4G network but he is not able to navigate or make phone calls. I find this weird as I've read in many places that Verizon's GS7 are unlocked to work on GSM.
Any thoughts on what can be done?
Click to expand...
Click to collapse
You should be able to put in the GSM sim and set the APN to what the carrier recommends and it works. It may not support all of bands that that carrier uses but it should work. You could also flash the Verizon SM-930v to the firmware for the Unlocked SM-930u via Odin and unlock more of the GSM bands. Most like it is just a APN issue
PGHammer said:
It won't connect in Brazil because they are GSM-only; whereas VZW is a CDMA-only network. South America is like the EU - mostly,l if not entirely, GSM-only; VZW and Sprint are using different (and not cross-compatible) types of CDMA. Tracfone (and their Safelink lifeline division) is an MVNO that uses T-Mobile and VZW towers for coverage (and thus support both GSM and CDMA phones). Tracfone has both GSM and CDMA SIM kits - however, the SIM kit you purchase must match the target phone. (Some phones, such as the Galaxy Nexus, for example, are available in both sorts - maguro for AT&T Mobility and T-Mobile/Deutsch Telekom, and toro/toroplus for VZW and Sprint; there are even "unified" ROMs (the Tuna versions are neutral in this fashion, and are available from JB to N - PureNexus 7.1.1 for Tuna is my default, and is just one such example). It may be possible to modify the radios to support GSM bands; however, I would not recommend it.
Click to expand...
Click to collapse
You have no idea what you are talking about. All Verizon phones are sim unlocked and since the HTC Thunderbolt, they all support a lot but not all GSM bands. All newer Verizon phones are world phones and usually just need the proper APN of the Telecom being used. Again they do not support all GSM bands but the do cover a lot of them that are used internationally.

nrage23 said:
You should be able to put in the GSM sim and set the APN to what the carrier recommends and it works. It may not support all of bands that that carrier uses but it should work. You could also flash the Verizon SM-930v to the firmware for the Unlocked SM-930u via Odin and unlock more of the GSM bands. Most like it is just a APN issue
You have no idea what you are talking about. All Verizon phones are sim unlocked and since the HTC Thunderbolt, they all support a lot but not all GSM bands. All newer Verizon phones are world phones and usually just need the proper APN of the Telecom being used. Again they do not support all GSM bands but the do cover a lot of them that are used internationally.
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I will second both of these post in every way. Lol. I was thinking it just tryin to keep to myself

Agreed. You could purchase the phone and flash the U firmware. That's what I have done. I have used my Verizon s7 on Att and TMobile through their mnvos respectively

To wrap up in a nutshell what everyone else was saying...
1) The G930V S7s have both CDMA and GSM radios, so will work on both types of network.
2) Verizon phones are NOT network locked.
3) You need to check the GSM frequencies for your local network. The G930V uses GSM 850/900/1800/1900 for 2G & UMTS 850/900/1900/2100 for 3G. If your local network doesn't use any of these bands, the phone won't work for calls/SMS.
4) Flashing the 'U' firmware will only add UMTS 1700. There used to be a way to get into the radio settings and add/remove frequencies using a service code, but I believe that Samsung have locked down that ability.

Great info
Great info!

activate ATT v35 on sprint or any cdma mvno

tried to run the imei number on the sprint and verizon site, says cannot be activated. Went to sprint and called verizon, says att branded phone cannot be activated. This is unlocked, works on tmo. tried searching for a solution in the forum but no dice.

nerd2k said:
tried to run the imei number on the sprint and verizon site, says cannot be activated. Went to sprint and called verizon, says att branded phone cannot be activated. This is unlocked, works on tmo. tried searching for a solution in the forum but no dice.
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Doesn't matter if it's "unlocked", other carriers have their rules for what they allow on their networks. Most AT&T phones don't have CDMA, and Sprint, Verizon (for now) still uses CDMA.
On non-branded phones you won't get VoLTE from most carriers (T-Mobile is the exception) and without VoLTE you would need to temporarily drop down to CDMA for voice calls on Sprint and Verizon.
Even on phones that have CDMA, like the LG V30 US998, Verizon still wants you to buy their branded phones -- because end of this year when CDMA goes away, those phone still won't have VoLTE. So in a few months those phones won't be able to make phone calls. I have two relatives with LG V30/V30+ US998 on Verizon. Don't ask how, there are ways. But even of 2020 they will need new phones when Verizon kills CDMA and they can't get VoLTE on non-Verizon phones.

nerd2k said:
tried to run the imei number on the sprint and verizon site, says cannot be activated. Went to sprint and called verizon, says att branded phone cannot be activated. This is unlocked, works on tmo. tried searching for a solution in the forum but no dice.
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As an owner of an AT&T v35 I can tell you it will work nicely on the Verizon network including VoLTE and VoWIFI. You do have to jump through a few hurdles. You will need a SIM activated on the Verizon network. That may mean buying a new phone from Verizon. You also need to SIM unlock the v35 by buying a code from a site like codes2unlock.com. You may also need to cross flash to the NA rom. These things should be done in that order, and there is no going back to an AT&T rom afterwards.
ChazzMatt said:
Even on phones that have CDMA, like the LG V30 US998, Verizon still wants you to buy their branded phones -- because end of this year when CDMA goes away, those phone still won't have VoLTE. So in a few months those phones won't be able to make phone calls. I have two relatives with LG V30/V30+ US998 on Verizon. Don't ask how, there are ways. But even of 2020 they will need new phones when Verizon kills CDMA and they can't get VoLTE on non-Verizon phones.
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Chazz, can you clarify this? I have a US998 v30s running on Verizon with VoLTE. It was my understanding that it will not be affected by shutdown of cdma by Verizon. I like the phone and want to continue using it.

cmrntnnr said:
As an owner of an AT&T v35 I can tell you it will work nicely on the Verizon network including VoLTE and VoWIFI. You do have to jump through a few hurdles. You will need a SIM activated on the Verizon network. That may mean buying a new phone from Verizon.
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My brother-in-law found Verizon store rep willing to break the rules for he and my sister's USS98 V30+ (converted from Sprint LS998). They switched from AT&T to Verizon.
This guy said "Verizon wants you to buy their phones, of course. They'll tell you this phone (US998) won't work, but it will." He activated two SIM cards and put them in their US998.
He said "If you have any issues, ONLY see me here at this store. Don't talk to any other reps about this." Wink, wink, nudge, nudge. (Monty Python reference.)
My brother-in-law and sister don't have V35 on Verizon, but you probably have VoLTE because you enabled VoLTE on another phone (Droid Turbo)? I don't know if they have Verizon VoLTE on US998 V30+, but I assumed they didn't...
cmrntnnr said:
Chazz, can you clarify this? I have a US998 v30s running on Verizon with VoLTE. It was my understanding that it will not be affected by shutdown of cdma by Verizon. I like the phone and want to continue using it.
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If you have Verizon VoLTE now, then nothing will change.
I assumed my brother-in-law and sister don't have VoLTE and are temporarily dropping to CDMA for phone calls. But I have no way of easily checking. Neither would know what "VoLTE" is nor "CDMA".
I merely told them their US998 phones were carrier unlocked and would work on Verizon -- if they got already-activated SIM cards. My brother-in-law used his considerable sales skills and found a helpful rep.

thanks a ton @chazz for the clarification. i have already move to AMZ 9.0 which looked to be pure android. was not able to get NAO due to error(sha256 auth error). AMZ was the only one that worked from multiple different firmwares(lgfirmware /sammobile) from us region and it works awesome.
For the verizon sim card, can i buy flip phone or a throw away verizon smart phone with the activated sim card and use it with the v35. similarly can you use the approach for sprint?
Again your response is much appreciated.

You should consider features you want to have on your account when buying the phone from Verizon. Some can be toggled through the the settings menu on the v35 like Advanced Calling for VoLTE, but others can't like visual voice mail. Ask to have them activated when you buy the phone. Keep that Verizon phone, you may have to get help in the future from Verizon and it will come in handy! They won't be impressed with the v35.
I don't have proof of it and am not in a position to test, but I suspect you cannot activate a Sprint sim on a Sprint phone and then move to the v35. My understanding from reading about the open market ULM and AT&T branded v35 is that Sprint maintains an IMEI whitelist. Sprint only allows Sprint branded phones on their network. This is why the ULM model is preferred for Google FI.
Please post what you learn so others can benefit.
nerd2k said:
thanks a ton @chazz for the clarification. i have already move to AMZ 9.0 which looked to be pure android. was not able to get NAO due to error(sha256 auth error). AMZ was the only one that worked from multiple different firmwares(lgfirmware /sammobile) from us region and it works awesome.
For the verizon sim card, can i buy flip phone or a throw away verizon smart phone with the activated sim card and use it with the v35. similarly can you use the approach for sprint?
Again your response is much appreciated.
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VS995 - do 'Unlocked' versions still have HD Voice?

I am trying to buy a new V20 VS995 on ebay right now, but the only NEW ones all say they are 'Unlocked' (I need the VS995 because I have Verizon). I made a previous post yesterday and the responses made me do some research, and I have now learned that Verizon is retiring CDMA around the end of the year, and 4G NON-HD Voice phones will no longer work on the network beyond that. The VS995 does indeed have HD-Voice, but I am confused if the 'Unlocked' versions of the VS995 for sale are devoid of that feature, and if they are still Verizon compatible (since I also have read the "unlocked" US996 model no longer works on Verizon)? If so, then I'd rather get a non-unlocked VS995 phone because it would still be useful beyond 2020. I am a total noob compared to most people here... so these may be basic questions. If anyone can help me in making my decision, I'd be so so thankful.

I'm sorry if my post made no sense. I am just wondering if VoLTE is on the VS995 'unlocked' version. Or if I need to get a 'Network Locked' version to have the VoLTE feature. Verizon it seems will discontinue any non-VoLTE phones, and not allow me to activate them at this point. Just what I read, maybe I'm wrong. I don't want to waste my money. I hope this question makes some sense.

All VS995 phones actually came SIM unlocked out of the box because for a while up until last summer, Verizon was required by law to have their phones come unlocked as part of a deal when they purchased some network frequencies a while back. So, all VS995 models are the same and may only differ by the software that's currently installed when you buy one. VoLTE on Verizon should work on any VS995.

C D said:
All VS995 phones actually came SIM unlocked out of the box because for a while up until last summer, Verizon was required by law to have their phones come unlocked as part of a deal when they purchased some network frequencies a while back. So, all VS995 models are the same and may only differ by the software that's currently installed when you buy one. VoLTE on Verizon should work on any VS995.
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Thank you thank you thank you!!! I couldn't find that information anywhere, so it really helps a lot for you to share it.

Isn't VoLTE dependent on whether your service provider provides it. I only get voicemail messages when I put my fone on LTE/CDMA.
Settings>More>MobileNetworks>SystemSelect> NetworkMode give me options of Global, LTE/CDMA and LTE/GSM/UTMS. I don't get any calls if I select LTE/CDMA but data goes to 4G+ and won't throttle down to 3g. Advanced calling is greyed out as an option to select but that must be because my network provider doesn't provide it.

ezzony said:
Isn't VoLTE dependent on whether your service provider provides it. I only get voicemail messages when I put my fone on LTE/CDMA.
Settings>More>MobileNetworks>SystemSelect> NetworkMode give me options of Global, LTE/CDMA and LTE/GSM/UTMS. I don't get any calls if I select LTE/CDMA but data goes to 4G+ and won't throttle down to 3g. Advanced calling is greyed out as an option to select but that must be because my network provider doesn't provide it.
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Yes, availability of VoLTE and Wi-Fi calling depends on the support of the carrier. And at least in the U.S., if the carrier provides those features, the phone also has to be on whatever certification whitelist the carrier uses. Within the next 2–3 years, all major U.S. carriers are planning to shut down all networks below LTE (2G/3G/CDMA), so VoLTE will become a requirement to make phone calls over here. This may become an issue for any unlocked US996 owners in the U.S. as I don't know if that model gets VoLTE on the other carriers such as AT&T and T-Mobile, who strongly prefer their carrier-branded H910 and H918 variants.

4g calling on US996?

I'm currently using a US996 (the "real" factory unlocked version, not the US cellular one), and was hoping to do so for as long as possible. Unfortunately, my current carrier is AT&T and it seems that they will be dropping support for 3g calling early next year- which I am told will render my model unable to place or receive phone calls.
Anyways, I have *heard* that my device will be supported if I switch to T-mobile, but this comes from some googling a year or so ago and probably some less-than-reliable sources.
I was hoping to get a run-down on what my options are if I want to retain both my current device and ability to make phone calls come 2022. I currently have an unlocked bootloader + LineageOS installed on my phone as well, and would prefer to maintain that rather than having to use a locked-down carrier ROM

I have seen mixed reports from users who got VoLTE working on T-Mobile for their US996 while others did not (I'm still on a Sprint MVNO, so I won't be able to test this myself until T-Mobile completely takes over the network). But what's certain is that only the H910 can get VoLTE on AT&T (they keep a whitelist that determines which phones can get it), and LineageOS on pretty much any LG phone will likely never have it working.
So, at a minimum, you'll have to at least go back to a stock-based ROM if you plan on using a V20 next year on any carrier in the U.S.

I am not XDA savvy so forgive me if this is not what you are asking.
I have US996 factory unlocked ,I am on stock 8.0 and use Net10 which is ATT and do calling with LTE. which I assume is 4G.

mghia said:
I am not XDA savvy so forgive me if this is not what you are asking.
I have US996 factory unlocked ,I am on stock 8.0 and use Net10 which is ATT and do calling with LTE. which I assume is 4G.
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What OP is saying is that the calls on AT&T and its MVNOs for a US996 are actually done through 3G/HSPA and not LTE, unlike cellular data. AT&T's own H910 is the only V20 model that can make calls through LTE (VoLTE) on their network. Once AT&T turns off the 3G networks early next year, calls will no longer work on the US996 and any phone that's not on AT&T's whitelist.
You should be able to see this on your phone: When making a call, the LTE icon will not stay up, indicating that VoLTE is not working.

Oh nifty this phone becomes more and more an issue. So now I ahve to add this to my plate. Seems like it will still be a year. OK but the US996 has LTE so why is this still a problem? Why wont it just use the LTE band?
Please be kind I do not know all the acronyms or how any of this all works.
Cant the US996 also run on Verizon?

mghia said:
Oh nifty this phone becomes more and more an issue. So now I ahve to add this to my plate. Seems like it will still be a year. OK but the US996 has LTE so why is this still a problem? Why wont it just use the LTE band?
Please be kind I do not know all the acronyms or how any of this all works.
Cant the US996 also run on Verizon?
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Click to collapse
Because of its whitelist I linked in the second post, AT&T actively blocks any phone not on the list from using LTE for calls (VoLTE = voice over LTE).
As for Verizon, they blocked direct activation of the US996 starting in 2018. You will see that entering your phone's IMEI number on Verizon's website will give you a message saying it's not compatible with their network even though it is perfectly capable. It may still work if you insert an already-active Verizon SIM card in there, but I don't use Verizon, so I can't say for sure if that still works.

Wow, talk about a way to force new contracts and phone sales. I never had a phone not be useable for PHONE CALLS. I guess I am grateful for the heads up as I was not aware and Net10 did not inform me of such things. I bought this phone because of specs and it was a removeable battery . But it seems this phone just was a pain from the start, with the screen issues, and the company claiming they would upgrade to Pie and never did.
T-mobile did not have useable coverage in my area when I tired it several years ago. So I really do not know what is going on since they now have Sprint.

Not sure if you're still looking at this thread but i have a v20 us996 factory unlocked and a G6 us997 factory unlocked and they BOTH get VoLTE on Red Pocket Mobile AT&T mvno. Calls DO NOT fall back to 3g or 2g and data stays active while in calls.