LS997 on US99610p - no LTE or internet - LG V20 Questions & Answers

I've researched and done as much homework as I can but I can't seem to find the solution, so I'm starting this thread in the hope that someone can point me in the right direction. I've had an LS997 on Sprint since it launched but recently broke the screen a second time. After getting a couple bum screens off ebay, I decided to just purchase a new V20. Found one on ebay that was an LS997 unlocked. Figured why not, hopefully it is rootable and I can do some stuff with it. Got the phone, swapped my SIM, chatted with Sprint customer support, and got the phone to receive calls and texts. However, it wasn't getting LTE coverage like my old V20 and could not connect to the internet via mobile network (WiFi works fine).
The new phone is an LS997 (FCC ID: ZNFLS997) with software US99610p, build number NRD90M, Android security patch April 1, 2018. I am guessing that part of the trouble here could be that I am unable to activate fully with Sprint since I am not on a Sprint ROM (no option to update PRL, profile). Are there any working Sprint-based ROMs out there that I haven't stumbled upon?
I'm also wondering if the missing Sprint bands on the US996 firmware is giving me issue. SignalCheck Pro shows my old phone bouncing between bands 25 and 26 at my house, and obviously the US996 firmware doesn't have band 26. With the new phone being LS997 hardware, is there any way for me to gain access to those bands (by flashing a modem, etc)?
Any help would be greatly appreciated!

Rooted LS997 owner here. Yes, you have to be on a Sprint ROM to complete activation. Without completing that step, I don't think you can get everything to fully work on Sprint's network. The cross-flashed US996 firmware is useful for GSM networks around the world but not for Sprint or its MVNOs. Since Sprint does not provide firmware (KDZ) files, you'll have to go through the rooting process (check this guide) and then install a Sprint ROM (I recommend ClassicRom) at the end. If I remember correctly, there is a step during the rooting process where you flash some Sprint firmware that should take care of the modem part.

felixdacat76 said:
I've researched and done as much homework as I can but I can't seem to find the solution, so I'm starting this thread in the hope that someone can point me in the right direction. I've had an LS997 on Sprint since it launched but recently broke the screen a second time. After getting a couple bum screens off ebay, I decided to just purchase a new V20. Found one on ebay that was an LS997 unlocked. Figured why not, hopefully it is rootable and I can do some stuff with it. Got the phone, swapped my SIM, chatted with Sprint customer support, and got the phone to receive calls and texts. However, it wasn't getting LTE coverage like my old V20 and could not connect to the internet via mobile network (WiFi works fine).
The new phone is an LS997 (FCC ID: ZNFLS997) with software US99610p, build number NRD90M, Android security patch April 1, 2018. I am guessing that part of the trouble here could be that I am unable to activate fully with Sprint since I am not on a Sprint ROM (no option to update PRL, profile). Are there any working Sprint-based ROMs out there that I haven't stumbled upon?
I'm also wondering if the missing Sprint bands on the US996 firmware is giving me issue. SignalCheck Pro shows my old phone bouncing between bands 25 and 26 at my house, and obviously the US996 firmware doesn't have band 26. With the new phone being LS997 hardware, is there any way for me to gain access to those bands (by flashing a modem, etc)?
Any help would be greatly appreciated!
Click to expand...
Click to collapse
Seems you got lucky yourself on finding a rootable. I just got my new rootable ls997 last night. Have yet to run Dirty Santa to full root again. Very rare phone. I agree with C D here tho. Classic ROM is made specifically for ls997 and is the least buggy stock based custom ROM and is best for full activation. Also MK2000 BTTF Kernel is solid just in case.

I appreciate the responses! Looks like I'll be giving the Classic ROM a shot this week.

Good luck. And I second the recommendation for the mk2000 BTTF kernel (you can find it here).
One of the things this kernel does is get rid of LG's root checker called RCTD, which seems to log random things on rooted phones. You don't hear much about it any more because all the more recent ROMs have automatically gotten rid of it through their own kernel settings. I don't know a whole lot about RCTD itself, but if curious, there's some info here.
Also, the kernel allows you to change the KCAL screen color settings via a kernel manager like this one to help prevent any temporary screen retention (which you may already be familiar with). There are also some XDA threads where people posted different KCAL values that worked for them:
https://forum.xda-developers.com/v20/themes/post-kcal-values-t3865442

Related

The Ntelos S5

I have an ntelos S5 (G900R7). There is no development for this phone anywhere on the internet. Perhaps I can find support here?
---------
So far (you may skip this part):
I have managed to successfully install Spirit Rom with full functionality, by copying my old build.prop into the system directory, and restoring my previous apn settings using the apnsbu. I forget why I left this rom, but I did. Everything I try has some problem! I then proceeded to try just CM11, by itself, and had 3g difficulties. Then, using Kushman's sprint MIUI, (Ntelos shares sprint towers) things seemed to work right, but it remapped my recent app key to menu... (perhaps I can map it back?) and the volume was not controlled by my physical volume buttons.
-----------
Now my favorite rom so far: Mokee Rom It's fast and visually pleasing, but I have wi-fi and phone difficulties.
After imposing my APN settings, I can reproduce these effects:
(1) Before replacing build.prop, the wi-fi works and can be enabled or disabled as I need. Also, 3g works very well at nice speeds, but it says "Verizon Wireless" underneath the 3g indicator bars. However, I cannot make calls. If I attempt to do so, the 3g data stops working, turns orange, and no longer says "3g". If I do this, then no data can be transmitted or received.
(2) After Replacing build.prop with the "good original" copy (which sometimes fixes similar problems in other custom roms) the wi-fi becomes stuck in a constant state of "turning wi-fi on..." but never turns on. 3g still works, but, as in part (1), it will break if I try to make a call.'' Also, in this case it says "Sprint" instead of "Verizon Wireless"
Does any one have advice, or perhaps some build.prop settings to modify? Or maybe there's a different file that would help. Again, my phone is the SM G900R7. Has someone else with this phone had luck customizing it?
Thank you
nTelos S5
Likewise have a nTelos S5, have not found any custom roms that can successfully be installed without data or phone issues.
Also trying to install any ASOP roms resulted with all phone efs data getting cleared.
Upon searched relentlessly the only rom I found that functions is located at
http://teamcspire.com/index.php?/topic/112-gs5-g900r7-r2-teamcspire-nd8stock-deodexed-101814/
its very stock but functions flawlessly for me.
Advise if you have any luck, I will reciprocate.
doby-nut said:
Likewise have a nTelos S5, have not found any custom roms that can successfully be installed without data or phone issues.
Also trying to install any ASOP roms resulted with all phone efs data getting cleared.
Upon searched relentlessly the only rom I found that functions is located at
http://teamcspire.com/index.php?/topic/112-gs5-g900r7-r2-teamcspire-nd8stock-deodexed-101814/
its very stock but functions flawlessly for me.
Advise if you have any luck, I will reciprocate.
Click to expand...
Click to collapse
My advice is to you, is that if you install Mokee rom, do not update it with OTA update. This is what I think broke the network for me. Even after restoring my phone to factory conditions and using Kies, I still had no network. I ended up going to the nTelos store, where they had to reset the network service for my phone on their end... strange.
Anyway, I have made a few roms work, and I suspect I could make more. If you maintain your apn settings, and build.prop, you should be able to make Spirit rom work. The same thing is true for Miui. However, if I remember from my experience correctly, if you do install Miui, then I THINK you should not restore your original build.prop; it may work without it... just restore the apn settings. When you do this, you may have to change the preferred network mode... I am a little freaked out, after my previous experience with Mokee rom, to mess with this any longer, though. I do have a problem with Spirit rom: if I use the Timely alarm clock, the time panel is miscolored, but I believe that could possibly? be fixed by flashing a different kernel. I plan on flashing Spirit tonight.... stock uses up my battery too fast, and Spirit just feels more responsive.
EDIT: I just re-flashed Spirit Rom, and they fixed the discoloration in the most recent version! Also, as before, my 3g and WiFi work fine.
Took me days...
The CSpire shares the model number and ROM. The US Cellular CM11 is the closest. Somewhere in that I lost my ability to send texts (not sure if it's the SMSC or...) and didn't get it back when I ODIN'd to stock. I would LOVE to have CM support for this model.
I also am in the same boat as you guys. I would love to get another reliable ROM on this phone. I just have bad memories of purchasing my last one (Sprint GS3) from ebay, and having one hell of a time making the MMS work after flashing it for nTelos. However, I never did have to mess with any of the APNs or build.prop settings on that one. I would think the Sprint ROMs should be the closest compatible ROM, being that nTelos and Sprint do share towers in WVa and Va (Sprint actually has zero towers in these states, and leases nTelos towers instead).
Is using EFS Backup by Wanam a good method to insure the EFS does not get screwed up?
caezec said:
(1) Before replacing build.prop, the wi-fi works and can be enabled or disabled as I need. Also, 3g works very well at nice speeds, but it says "Verizon Wireless" underneath the 3g indicator bars. However, I cannot make calls. If I attempt to do so, the 3g data stops working, turns orange, and no longer says "3g". If I do this, then no data can be transmitted or received.
(2) After Replacing build.prop with the "good original" copy (which sometimes fixes similar problems in other custom roms) the wi-fi becomes stuck in a constant state of "turning wi-fi on..." but never turns on. 3g still works, but, as in part (1), it will break if I try to make a call.'' Also, in this case it says "Sprint" instead of "Verizon Wireless"
Click to expand...
Click to collapse
You might try saving out your wpa_supplicant file from the stock ROM and replacing it on the flashed ROM. This has worked for me before on my GS3. That might take care of the wifi anyway.
I'm also on ntelos with the s5 now. But it is a us cellular unlocked by them phone. Stuck in a ntelos sim card that I bought from store and everything works. Except 4g. I can live w/o it but it's kinda like a puzzle now. How could I enable this to work on ntelos?
Depending on where you are, ntelos does not have 4G in many places yet. It's still very spotty in West Virginia.
Has anyone taken the OTA Lollipop update? If so, how is it working and does it lock or put in a new bootloader?
I have. It's a little laggy at times, gets really hot when using it while charging and battery drains a little faster. Not sure about the bootloader
i4get75 said:
I have. It's a little laggy at times, gets really hot when using it while charging and battery drains a little faster. Not sure about the bootloader
Click to expand...
Click to collapse
I think I will hold off for a while. My stock NK1 is laggy enough as is. Damn, I wish there was a compatible ASOP ROM available for this phone.
Honestly, this Samsung G5 is the absolute worst phone I have ever owned! I would like to get a S6, but my experience has been so bad with this S5, I am almost afraid to stick with Samsung. However, my S3 was awesome!
Just found out that the heart rate sensor is active when the phone is on no matter if S Health is open or not.
I am in the Richmond area on Ntelos. They have stated they have sold their bandwidth to T-Mobile and we are to find another carrier. My phone is not even a year old and no other carrier will activate it. Being I own mine outright and paid close to $600, I am about to lose my mind knowing that I will have a shiny expensive very small tablet in a few months. Has anyone a clue how to change this phone over to GSM or something useful. Verizon refused to even try, though I know when I tried Straight Talk's Verizon Sim it did dial to Verizon's customer service. But Straight Talk nor Verizon would activate it.
Ideas and suggestions welcome.
puterdoc said:
I am in the Richmond area on Ntelos. They have stated they have sold their bandwidth to T-Mobile and we are to find another carrier. My phone is not even a year old and no other carrier will activate it. Being I own mine outright and paid close to $600, I am about to lose my mind knowing that I will have a shiny expensive very small tablet in a few months. Has anyone a clue how to change this phone over to GSM or something useful. Verizon refused to even try, though I know when I tried Straight Talk's Verizon Sim it did dial to Verizon's customer service. But Straight Talk nor Verizon would activate it.
Ideas and suggestions welcome.
Click to expand...
Click to collapse
page plus,i am an ntelos dealer and pageplus dealer i flash phones to and from both companies everyday i am in ruckersville va 12 mile north of charlottesville lemme know if you need help you right its the enitre eastern side of the companyh is gone now to tmobile but you can still activate on frawg..ive done many for customers
Thanks for the info. I am on the frawg side of things now. Their plans were too much when mine ended and I didn't need a phone at the time. Then a few years later, yeah I made my S1 last almost 4 years, I bought the S5 late last year outright. Loved the S1. Made that do everything it just did everything slow at the end.
Anyway, am glad there are options of some sort. Have been reading the reviews of pageplus. What kind of speeds are you getting on it with 4G? Their map shows coverage everywhere which makes me a bit uneasy, as in too good to be true. Is it a simple flash or require editing?
If I can't do something else with the phone, I may try the band opening options. According to the phone specs, it should already have all the Verizon bands but they refuse to activate it due to the meid it seems. I have a feeling this topic may get more viewers as the Ntelos off switch day comes closer.
Google Fit was the culprit for the heart rate sensor staying on. Un-installed it and fixed it
After all this time, has anybody found a ROM that works well on this phone?
can't get data so Internet not working on galaxy s5 unlocked already switched ntelos
njdan30 said:
page plus,i am an ntelos dealer and pageplus dealer i flash phones to and from both companies everyday i am in ruckersville va 12 mile north of charlottesville lemme know if you need help you right its the enitre eastern side of the companyh is gone now to tmobile but you can still activate on frawg..ive done many for customers
Click to expand...
Click to collapse
My internet is not working but I can get talk and text
In case nobody has seen this, there is a now a CyanogenMod 5.1.1 ROM available now for nTelos. I have been running it for 3 days now and I really like it. Good battery life too. Very stable and very speedy. There are some occasional bluetooth audio stuttering issues, but nothing terrible.
See this thread.
http://forum.xda-developers.com/gal...ent/unofficial-cm-12-1-g900r7-inland-t3255191
FYI, Cyanogenmod 13.0 (Android 6.0.1) is available for nTelos and C-Spire (and other) devices here. http://forum.xda-developers.com/gal...ent/unofficial-cm-12-1-g900r7-inland-t3255191
Sucks for ntelos customers bring forced into sprint at least the CDMA phones and iphones are unlocked
Sent from my SM-G935F using XDA-Developers mobile app
---------- Post added at 03:56 AM ---------- Previous post was at 03:52 AM ----------
njdan30 said:
page plus,i am an ntelos dealer and pageplus dealer i flash phones to and from both companies everyday i am in ruckersville va 12 mile north of charlottesville lemme know if you need help you right its the enitre eastern side of the companyh is gone now to tmobile but you can still activate on frawg..ive done many for customers
Click to expand...
Click to collapse
Sorry it's been a year only thing needed was a sim card and set apns it'll be 3g but beats a paper weight it'll get evdo and ehrpd speeds some cases you can get lte but very limited areas
Sent from my SM-G935F using XDA-Developers mobile app

No VOLTE and no WiFi calling T-Mobile, what gives?

I'm gonna make a post here since NOTHING seems to be working. I'm a T-Mobile customer. Yesterday, I purchased a great condition nexus 6P from someone because my LG G5 is cracked and I was getting tired of it anyway so I opted to just buy a nexus instead of using my insurance on that phone. Everything is all good except for one major issue. VOLTE and WiFi calling just refuse to work with my sim in the Nexus.
I've called T-Mobile twice. I've factory reset from back up and reset settings twice. I've hard reset from stock recovery once. I've wiped network settings and restored default apns. I've manually changed the apns from what I see on Google, reddit and here. I've copied my apns from my LG G5 where VOLTE and wifi calling work perfectly fine. I've cleared cache. I've cleared the cache of the project fi and hangouts apps just in case there's something left over from the previous owner. I've gone into the *#*#4636 menu and tried a bunch of different stuff several times but no matter what I absolutely can not get wifi calling or VOLTE to work with TMobile on my nexus 6P. LTE it's self works perfectly fine for data.
Yes, all settings for wifi calling and enhanced LTE calling and VOLTE are turned on lol. I've tried the trick where you toggle wifi preferred on and off and restart the phone. Nothing happens. I don't even get a wifi calling reg error. It never shows as active in the data toggle in the quick settings are nor the status bar or dialer. It just isn't active. Same for VOLTE. I AM getting band 12. I can see it in the LTE discovery app. VOLTE just isn't working though. Whenever I make a call I can see LTE switching off and it switches to HSPA therefore making calls really difficult in my shoddy signal area at my house which is why I really need it to work.
I'm fairly certain I can root and install a ROM which will fix these problems but I don't own a PC. . I thought MAYBE the previous owner had previously had the phone rooted and tinkered with something somewhere that may have messed something up but that doesn't appear to be the case. Bootloader is locked and recovery is stock.
Can anybody help and tell me what in the world is going on here? I don't want to have to sell this nexus and revert back to my cracked screen G5. I would just switch carriers but I still owe money on the G5 so I was just gonna ride it out til I payed it off.
O and one last thing, after scowling google and forums for hours on end yesterday and today I did see one post mentioning something about this stuff being related to IMS provisioning and settings which are tied to a phones IMEI on T-Mobile and not the sim card and how that person simply called T-Mobile and got a hold of wifi calling technical support who was clueless but created a ticket for him and within 72 hours the issue was resolved. OK well I did the same exact thing and they refuse to create a ticket for me because it's not a T-Mobile phone and because according to them they are not allowed to create a ticket because wifi calling works fine in my G5 and therefore it's the phone and not them or their network lol. What a crock. I'm willing to bet if I put the sim in another unlocked phone with 7.1.1 and wifi calling fully available that it isn't going to work either. There's some sort of communication error going on between the sim being in this phone and their network it appears.
Check these screenshots out. T-Mobile is clueless
http://imgur.com/5MuO34s
http://imgur.com/XVd8CdA
http://imgur.com/uUGN3ae
http://imgur.com/cfYxfqh
I can only suggest;
1) Find a PC and re-flash the latest factory images from Google. Both "fastboot flashing unlock" and "fastboot flashing lock" will wipe all data, so backup first. Also confirm it fully boots correctly after flashing before you re-lock the bootloader.
2) Get a new 3-in-1 SIMM from T-Mobile. You can use their web site to switch cards and give it 24 hours to be fully provisioned.
3) Confirm your E911 address is correct on T-Mobile's site and wait 24 hours after any changes for Wi-Fi calling to actually start working.
I HAVE THE SAME EXACT PROBLEM AS YOU POSTED!!! GONE THRU THE SAME PAIN. LOL I'll attempt the ticket thing to see if I get anywhere. Did you ever get it resolved?
EDIT:
My theory is that since the phone was used in Project FI, they specifically turn off this feature in the back end for the specific phones, by Imei or something since project FI uses T-Mobile as well.
EDIT 2:
they wont' create a ticket for me either. I guess I will just have to ride it out.
EDIT 3: I FIXED IT!! NEXUS 6P VOLTE AND WI-FI CALLING FIX T-MOBILE
I flashed back to android 6.0 Build#: MMB29N (I used the Nexus ToolKit 2.1.9: google it. BTW, your phone will be wiped, so backup first) VOLTE just started working with this version of android 6.0. Then I upgraded using the OTAs and now i'm on 7.1.1 build#: N4F260 with VOLTE and Wifi calling working as it should! I hope this helps someone out there!
For what it's worth, reverting to the build you mentioned fixed it for me on my two Nexus phones coming from Project Fi to T-Mobile as well! Thanks for the help!
You only need to install the radio from build MMB29N. I did this by downloading the build from the android website. Extract the radio from the zip and install it (I used nexus root toolkit but you can also just use flashboot if you wanted). This means you don't even need to revert your image and lose your data.
banancanard said:
You only need to install the radio from build MMB29N. I did this by downloading the build from the android website. Extract the radio from the zip and install it (I used nexus root toolkit but you can also just use flashboot if you wanted). This means you don't even need to revert your image and lose your data.
Click to expand...
Click to collapse
wish I had seen this sooner. cheers!
Had the exact same issue and this fix worked for me. Wasted a couple of hours with T-mobile (they were actually very helpful and debugged everything on their end to confirm the provisioning was good) and then 2+ hours with Google support. Actually had already filed for a device replacement which I canceled after finding this post.
I'm so glad I found this thread - my VoLTE and WiFi calling has not been working on T-Mobile and I'm anxious to give this a try. Numerous phone calls and support tickets with T-Mobile haven't resolved the issue. I don't know much other than how to follow detailed directions. My phone isn't rooted and bootloader is locked. I'm on Android version 7.1.2. Is there a way for me to install the MMB29N radio on my Nexus 6P without losing my app data given that my bootloader is locked?
k2kevink2 said:
I'm so glad I found this thread - my VoLTE and WiFi calling has not been working on T-Mobile and I'm anxious to give this a try. Numerous phone calls and support tickets with T-Mobile haven't resolved the issue. I don't know much other than how to follow detailed directions. My phone isn't rooted and bootloader is locked. I'm on Android version 7.1.2. Is there a way for me to install the MMB29N radio on my Nexus 6P without losing my app data given that my bootloader is locked?
Click to expand...
Click to collapse
Flashing the radio -sadly- requires an unlocked bootloader.
Did you resolve your problem?
In android 7.1.2 did you notice in Set preferred network type is set at " LTE/GSM/CDMA auto (PRL) "? 7.1.2 has been giving me issues with sms/mms. I noticed Android 6.0 has this set to correct T-mobile bands.
All works for me in 7.1.2. Make sure you don't download the Verizon version of the stock ROM. That was my issue why I couldn't have volte and Wi-Fi calling

Can't get PH1 to work on US CELLULAR!

I brought it in to US CELLULAR to get it turned on and the agent could not get it to work. He spent over a hour with tech support on the phone trying but with no luck! Essential's web site clearly states it will work on ALL major networks. I also went to ( Will my phone work) web site and it said it would work. Am I missing something and is there anyone that can help? I would love not to have to return this to BestBuy.
Do you have any updates on this issue? I’d like to get the essential phone, but us cellular is the only carrier that works in my area...
Thanks!
US Cellular being a CDMA carrier, all they have to do is add the MEID to their database. Is that what they're having an issue with?
original poster still hasnt updated. I'd really like to have this phone, but unfortunately i have to stay with US Cellular in my area
My apologies I thought I had. I returned it to Best Buy. Agent at USCELLULAR said they did not have the correct codes\ frequency or something for this phone yet but USCELLULAR would receive them sometime in the future. I too would've love to had this phone! I had to settle with a LG V30+ which is not bad I must say.
success! and failure
I had successfully used the essential ph1 on u.s. cellular for a month. By telling the associate it was a Google Nexus 6p they entered that sap ID (the code on each phone in the UScell database mentioned above) and everything worked perfectly. Yesterday I spent an hour on the phone with uscell tech support after my phone had quit working on their network. They have updated their database again something in that update is not allowing the ph1 to be recognized as a nexus6p anymore. I will need to find another work around or go to a different carrier unless uscell gets with the times soon
Which is yours' IMEI started with, 3 or 9?
I have the same issue. Mine worked on US Cellular perfectly until a few days after April 5 update.
Mine starts with a 3
robawb said:
I had successfully used the essential ph1 on u.s. cellular for a month. By telling the associate it was a Google Nexus 6p they entered that sap ID (the code on each phone in the UScell database mentioned above) and everything worked perfectly. Yesterday I spent an hour on the phone with uscell tech support after my phone had quit working on their network. They have updated their database again something in that update is not allowing the ph1 to be recognized as a nexus6p anymore. I will need to find another work around or go to a different carrier unless uscell gets with the times soon
Click to expand...
Click to collapse
Did you figure anything out?

Updating to Oreo via PC, help needed

Okay I'm in the UK and I've got a VS995 which does not seem to be able to connect to HSPA+ or LTE (Can get 3g, makes calls, texts and internet) or at least all it's displaying in the status bar is 'H'. A problem I'm trying to get to the bottom of even though I've done my homework and on paper it definitely should all work fine. I'm not sure what to think but it might be a problem with the modem drivers with the Nougat ROM from Verizon, or something wrong with the antennae as I've tried all sorts of settings which work fine with all my other devices. I'm also aware Verizon has rolled out globally a long awaited update bringing Oreo to the phone.
I'm thinking that if I can update the phone it might resolve my issues but trying to do this via the phone itself is futile and all it tells me is I'm on the latest version, other people in the UK with this exact phone have been offered the Oreo update. Now I've downloaded the VZW utility application and LG Bridge along with LG usb drivers to my Win10 PC. But I still can't get a connection or it seems to connect and immediately disconnects after I tick a box concerning some legal documents. I did see in device mgr the LG usb drivers but after a reboot they seem to have disappeared!
So either the LG software is pance or I'm not doing things right. So here goes I'm here to ask you knowledgeable folk how do I get my hands on the Oreo update and what software/drivers should I install to update my phone from the PC? I was going to go down the route of a custom ROM but I'm going to give this official Oreo update a shot.
Hi,
Thank you for answering. Yes, I'm on vodafone (75% compatible) but I've also tried a Giffgaff sim (O2 Uk, 100% compatible) and though I'm getting LTE on all my other devices I'm only getting up to 'H' on the VS995.
I will certainly look into flashing Nougat Kdz with LGUP if you think it might sort out my issues with this phone. No idea how to do this yet but looks like there is plenty of help online. Thanks again
I have done it with this https://forum.xda-developers.com/v20/how-to/vs995-ota-20a-bin-direct-link-verizon-t3846320

Flashing new ROM on my SM-G935R

I have a SM-G935R (Samsung S7 Edge) from US Cellular. USC said the phone is unlocked. I have done no other mods with the phone, so its pretty much stock.
I switched to Google Fi, which this phone is supposed to be be supported, but I haven't been able to make a phone call in weeks, and I have a support case that's moved up all the way to engineering @ Google Fi. I can text, use data, etc. at LTE speeds, anywhere I go--so literally the only thing broke is calling. I've called their codes to switch towers, I've factory reset, used a new SIM card, nothing has worked. Cell signal is always at 0 bars (even though data/texting continue to work). When I make calls, it immediately goes to the "Call ended" window before even getting a chance to play a dial tone sound.
A reddit user said I might have better luck if I flashed a TMobile ROM image on to the phone, which would unlock other cell towers that my phone would be compatible with. Google Fi confirmed that my phone will only work with TMobile towers as it is a USC device, but other fully featured phones can use towers from many other companies.
My question is, is that true, and if so, how do I go about knowing what TMobile ROM image to use? FWIW, I'm new to rooting/ROM scene, but am "technology inclined." My biggest issue right now is parsing out the data on the xda forums and figuring out what I actually need. I was expecting to find a T-Mobile ROM image and instructions on how to use Odin to flash device, but I'm guessing it may not be that easy? I'm not even worried about rooting/modding device after getting T-Mobile image on there--at least for now.
Edit: Can I just use Odin, download G935T from Sammobile, and go through the steps to put TMobile stock ROM on my device and consider it done?
Thoughts, guidance, opinions?
S7 edge no signal bars
If your phone is already unlocked you can flash a combination file using odin and the flash the tmobile firmware. I perform a factory reset after flashing the firmware.
Combination bit 9/u9 (you may need mod odin to perform the flasing)
COMBINATION_ATT_FA60_G935AUCU9ASA1_ATTFAC_CL11071963_QB22035767_REV02_user_mid_noship_MULTI_CERT.tar.rar
Firmware tmobile bit 9 u9
G935TUVS9CSB2
Im new to this forum and cannot include links but you can contact me.

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