Only LTE, no other bands/connections on sim slot 1 - Xiaomi Redmi 3s Questions & Answers

Its a bit of a wierd problem.
Suddenly my device only sees LTE/4G networks when SIM slot 1 is used. So no 2G or 3G networks are detected when i search for them.
- Changing the networks with *#*#4636#*#* does not work. even when i put it on "gsm only" no connection is found at all. (default i
- Tried different roms (Xiaomi EU and official Global roms both dev and stable tried but it doesnt change the fact)
- tried SIM in an other Redmi3s device and no issues there
- tried other sim in my device and it doesnt work.
And its only with slot 1. if i put my sim in slot2 there are no issues. (besides the fact that i loose the option of using an sd card)
Wifi/Bluetooth/GPS have no issues.
Searches on www and this forum lead me to issues where its the LTE band that doesnt work instead of the GSM/HSDPA and usually for both sim slots so can anyone point me in the right direction (or even have a solution for it
Device is (and was) not rooted and currently runs the official Miui9 weekly build (7.16.11)

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Help with Zenphone 2 laser ZE551KL, not detecting data sim card

I'm having problem with a Asus Zenphone 2 Laser ZE551KL.
I'm from Dominican Republic. I bought this phone to use 2 sims. one for calling (ORANGE) and the another for LTE Data (TRICOM).
This is my history:
When the phone arrive i put my 2 sims cards to the phone and update to the lastest Android version available: WW_ 1.17.40.1234. After that i can use the sim card ORANGE for calling but the data sim cards isn't detected by the Zenphone. I tried with another TRICOM Data sim card with the same result.
Also, i tried with a sim card from another company (CLARO) ant it works. it was detected by the Zenphone.
Later, i flashed CM 13.0 for the Zenphone and i get LTE data using the TRICOM sim card but for a 1 minute or less. I mean, when the phone boot up it get lte data and show me the icon LTE indicating that is working but after one minute the signal turn off. I only get data for that short time.
Also i test the lte sim card on another zenphone Z00A and it worked perfect.
the problem is that when using stock rom the sim card for lte data is not detectec. when i use CM 13.0 Rom, the sim card lte is detectec for a minute and it get loss.
Any suggestion about it?
I would like to try changing the modem version, but i don't know how to do it.
Did you check your APN settings? Different companies use different settings. Maybe the ROM doesn't have them set for one or the other SIM

Dual Sim not working. Only one sim works at a time

After making some changes in service menu, i am unable to use dual sim functionality. I can use only one sim slot at a time. The other one shows no network available. Regardless of which sim slot i use. In service menu sim slot 1 can be set to any preferred network but sim slot 2 is stuck in gsm only mode. Manually searched for network but no network available. Flashed latest oos 3.1.0,still the same issue. Can anyone help me with this.
Thanks in advance
Just restore whatever change you did in service menu and you should be back, you should not have played around in there from the beginning ?
pitrus- said:
Just restore whatever change you did in service menu and you should be back, you should not have played around in there from the beginning ?
Click to expand...
Click to collapse
Service menu doesn't have an option to reset to default and i don't remember exactly what changes i made. Yea i shouldn't have touched the service menu. If there's any thing else that can be done. Thanks for the quick reply
I think you changed radios to be only 3g/4g and your carriers uses the same band
Sent from my ONE A2005 using Tapatalk
fburgos said:
I think you changed radios to be only 3g/4g and your carriers uses the same band
Sent from my ONE A2005 using Tapatalk
Click to expand...
Click to collapse
I'm not sure what changes I've made but yes both providers use band 40 2300 mhz for lte. I've tried changing one of the sim to use only 2g so that both sims are on different band but still same issue.
If you are in an area where carrier uses exclusively LTE that's the problem, opt radio is dual standby it alternate between two signals in any of the combinations 2g-3g/lte but not 3g-3g or lte-lte
Sent from my ONE A2005 using Tapatalk
fburgos said:
If you are in an area where carrier uses exclusively LTE that's the problem, opt radio is dual standby it alternate between two signals in any of the combinations 2g-3g/lte but not 3g-3g or lte-lte
Sent from my ONE A2005 using Tapatalk
Click to expand...
Click to collapse
My phone was working fine few days ago. I messed up something in service menu, after that the problem started. I have set one of the sim to use 2g manually, still i can't find any signal and both carriers use 3 different bands.
Have you found any solution i am facing exact same issue after changing network band. please help
fburgos said:
I think you changed radios to be only 3g/4g and your carriers uses the same band
Sent from my ONE A2005 using Tapatalk
Click to expand...
Click to collapse
How to reset radio band i am facing same problem. I tried factory reset, restore old twrp EFS backup, clean flashing stock rom, flashing cm14.1. But problem is still there please help.
Finally......
Hello guys i solved this issue by flashing oxygen os 2.2.0 now my both sim are working fine.
Just flash oxygen os 2.2.0 which has dual SIM preference selection fix.
shan1990 said:
Finally......
Hello guys i solved this issue by flashing oxygen os 2.2.0 now my both sim are working fine.
Just flash oxygen os 2.2.0 which has dual SIM preference selection fix.
Click to expand...
Click to collapse
No wifi, no simcards detected...
Can you explain how it makes it work?
Here is a good read about such dual-sim issues (esp. posts #3,4):
https://forums.oneplus.net/threads/dua-sim-detection-problem-only-one-sim-being-detected.430976/
I'm a noob with this stuff, I read that forum and I'm still unclear... Is there a work around or am I screwed? Is it the phone/Software or my sim cards?
Here is the solution
In order to solve the problem go to service menu by dialing *#*#4636#*#* then turn off radio then select radio band 32 when it says successful, restart your phone and the problem will be solved
Say thanks at fb.com/suri131
You can contact for any other issue too
Finally solved the issue
I too faced similar issue and solved it now. I'll share my observations here.
I had 2 4g Sims Airtel and Jio. Jio for data. Both the sim's were working fine , once i went into roaming suddenly after that airtel stopped latching to network. Whatever sim slot i put my airtel sim it's not getting network if in the other slot Jio is there. I tried to use my airtel sim in other phones and it's working fine. I tried putting only airtel sim it's working fine in my OP2. I thought this may be imei problem and checked imei , my OP2 has both imei in it.
So now the fix part , for me 4g sim was working fine so tried fixing the other one in sim slot 1 i.e.. airtel.
*Install and open Shortcut Master(Lite).
*Menu->Search->Type "Engineering" -> Select "EngineerMode" from Search result (package name:com.android.engineeringmode.EngineeringMode) ->Launch.
*Click Network Set
*Click Sim Card Select -> sim 1
*Click Rat mode ->Select GSM only
*Click band mode->Select PGSM 900/1800
Now turn on Airplane mode on /off wait for a minute you should see both network.
Summary: In OP2 one slot will be 4g / other will be GSM 2g... So whichever sim is working for you don't change settings for that sim , play with the other sim for which no network is coming.
Abidbhat said:
Finally solved the issue
I too faced similar issue and solved it now. I'll share my observations here.
I had 2 4g Sims Airtel and Jio. Jio for data. Both the sim's were working fine , once i went into roaming suddenly after that airtel stopped latching to network. Whatever sim slot i put my airtel sim it's not getting network if in the other slot Jio is there. I tried to use my airtel sim in other phones and it's working fine. I tried putting only airtel sim it's working fine in my OP2. I thought this may be imei problem and checked imei , my OP2 has both imei in it.
So now the fix part , for me 4g sim was working fine so tried fixing the other one in sim slot 1 i.e.. airtel.
*Install and open Shortcut Master(Lite).
*Menu->Search->Type "Engineering" -> Select "EngineerMode" from Search result (package name:com.android.engineeringmode.EngineeringMode) ->Launch.
*Click Network Set
*Click Sim Card Select -> sim 1
*Click Rat mode ->Select GSM only
*Click band mode->Select PGSM 900/1800
Now turn on Airplane mode on /off wait for a minute you should see both network.
Summary: In OP2 one slot will be 4g / other will be GSM 2g... So whichever sim is working for you don't change settings for that sim , play with the other sim for which no network is coming.
Click to expand...
Click to collapse
it worked instantly
Abidbhat said:
Finally solved the issue
I too faced similar issue and solved it now. I'll share my observations here.
I had 2 4g Sims Airtel and Jio. Jio for data. Both the sim's were working fine , once i went into roaming suddenly after that airtel stopped latching to network. Whatever sim slot i put my airtel sim it's not getting network if in the other slot Jio is there. I tried to use my airtel sim in other phones and it's working fine. I tried putting only airtel sim it's working fine in my OP2. I thought this may be imei problem and checked imei , my OP2 has both imei in it.
So now the fix part , for me 4g sim was working fine so tried fixing the other one in sim slot 1 i.e.. airtel.
*Install and open Shortcut Master(Lite).
*Menu->Search->Type "Engineering" -> Select "EngineerMode" from Search result (package name:com.android.engineeringmode.EngineeringMode) ->Launch.
*Click Network Set
*Click Sim Card Select -> sim 1
*Click Rat mode ->Select GSM only
*Click band mode->Select PGSM 900/1800
Now turn on Airplane mode on /off wait for a minute you should see both network.
Summary: In OP2 one slot will be 4g / other will be GSM 2g... So whichever sim is working for you don't change settings for that sim , play with the other sim for which no network is coming.
Click to expand...
Click to collapse
Hey man. Installed a custom based on android 12 and i'm not sure what happened but only one sim card was working. Used msm tool to go back to oos 12 and now only one sim card shows.
Was going to try your method but the "engineeringmode" does not show up in search.
Any suggestions?

Moto x pure not registering onto GSM sim

Hi,
I have a Moto X pure 16GB (xt1575) bought from USA. I used it on multiple carriers in USA and it worked fine.
I am on a visit to India, where I intend to use the phone for couple of months.
I tried with these networks:
CDMA sim (Operator Tata Docomo) - Network gets detected and sim is operational
GSM sim (Operator Airtel) - Sim is detected but doesnt get registered onto network
GSM sim (Operator Reliance Jio) - Sim is detected but doesnt get registered onto network, seems some problem with Jio network, they have additional things for VOLTE to work.
So, I am pretty sure, the handset is fine, changed the network settings thru the secret menu phone info, to LTE, GSM to what not. nothing works for Airtel Sim.
The bands do work in India and are compatible.
Any idea's what more can I do?
Ahmplus said:
Hi,
I have a Moto X pure 16GB (xt1575) bought from USA. I used it on multiple carriers in USA and it worked fine.
I am on a visit to India, where I intend to use the phone for couple of months.
I tried with these networks:
CDMA sim (Operator Tata Docomo) - Network gets detected and sim is operational
GSM sim (Operator Airtel) - Sim is detected but doesnt get registered onto network
GSM sim (Operator Reliance Jio) - Sim is detected but doesnt get registered onto network, seems some problem with Jio network, they have additional things for VOLTE to work.
So, I am pretty sure, the handset is fine, changed the network settings thru the secret menu phone info, to LTE, GSM to what not. nothing works for Airtel Sim.
The bands do work in India and are compatible.
Any idea's what more can I do?
Click to expand...
Click to collapse
you can try and reflash the modem NON-HLOS.bin that is suited to your rom
the-light said:
you can try and reflash the modem NON-HLOS.bin that is suited to your rom
Click to expand...
Click to collapse
The rom is stock and generally dont fiddle around with the ROM's as I have never done it.
Can try it if nothing works.
I am noob, a procedure would be helpful or a link to it.
Thanks.
Apn?
lafester said:
Apn?
Click to expand...
Click to collapse
It does show the Apn, but the gsm service shows as unknown and network type as unknown.
Any users from India have any suggestions.
AIrtel and Jio work fine on the Moto X since many users here have and are using it with them, except the VoLTE part of Jio you have to use the Jio4voice app to make/receive calls.
Have you tried going into the Phone app, dialed *#*#4636#*#* and gone to Phone Info and changed "Set preferred network type" to something different?
Also, I think the Jio SIMs require a very specific registration process, going through several apps to get them working... check with a local shop.
Here's some snapshot from the menu screen and network finder applicaton.
I know the ans to this soln
i am a jio user and basically the problem is that mxp supports volte but the frequency is the main issue.. due to unmatchable frequency the volte ain't activated for jio
u can try t&t and Verizon sims volte is working on them but jio frequency is not up to that mark as mxp but an official nougat update might help the frequency to maintain and volte might get activated.....
so we need to wait for official nougat update only... trying romcwont work..
screenshots are here
http://i65.tinypic.com/yjvh5.png
http://i63.tinypic.com/25s6cmx.png
Thanks for the response, I will wait for the Nougat update.
Does the same apply for Airtel also ? It shown network type as unknown.

X722 problems with network

Hello guys! Can anyone help?
I've got my new X722 from GB few days ago. All were the best before I've inserted SIM card at the phone and find it cant properly work with 4G. Few hours of hard work and I find some strangenesses.
SIM card slot #1 can only work with 4G and only with internet. It cant make calls, sms etc. It says "Activation failed".
SIM card slot #2 works fine, but it needs time to wait to make it work with 4G. Sometimes it lose 4G and doesnt return back even if I try to switch "only LTE" or make network search (there are no 4G providers at the list).
So who had this problem? Is there any solution?
Firmware is 20s, stock.
4pda user fakimosha made a guide. So there are no problems with network any more. Can't post links so try to search it.

BSNL Network Reception Issue with OnePlus 6T

Guys,
I need help with my network reception issue in OnePlus 6T.
To brief you about its history,
I believe this started from OS Update 9.0.17 where below change-log was introduced,
Re-activated the calling function after the network has been reset.
At present my device is with 10.3.0 OS which is Android 10 based.
In issue description,
1. In some cases I receive network but it will not at all working (like in-out call & SMS). For inbound calls, my device shows out of coverage and for outbound calls it just keep on trying connecting and then get disconnected.
2. In some cases I will not receive network reception itself.
3. Issue reported with BSNL Network only. I tried with 3 different BSNL SIM and issue remain same for all.
4. No other network is affected (irrespective of 2G/3G). I tested with Airtel & Vodafone, where its working with 2G & 3G both.
Troubleshooting steps,
1. Tried flashing device completely (From OS & Recovery Both) - No Solution
2. Tried downgrading OS to 9.0.4 - No Solution
3. Tried selecting 2G network manually - It throws error as selected network is not available.
4. Tried changing Network Reception Scope to GSM/WCDMA only for BSNL Network slot (SIM2) - No Solution
5. Tried using BSNL only in SIM1 slot (keeping SIM2 empty) - No Solution
6. These same SIM Cards (JIO & BSNL) are working fine presently in my another OnePlus 5 device.
7. Tried disabling DSDS (Dual SIM Dual Standby) from *#*#4636#*#* but its not getting deactivated & remained active always.
I verified with Network Cell Info Tool where this BSNL network is showing greyed out (I dont know what does that mean) but I believe its representing internal root cause of this issue.
In app, neighboring cell is also losing connectivity randomly and not steady for BSNL network only.
It seems I've hit the same issue with my OnePlus 6 since the last couple of days. Happened after I did a 'reset network settings'. No solution yet. I have changed to a new BSNL 4G SIM and had factory reset of the phone.
Now the phone is with the service centre.
How did you resolve this issue?

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