Database Users

T-mobile V20 Band 12 solved

I know some people were having problems keeping or even getting on band 12 with the V20. The people at T-Mobile were useless, even the engineers. After much poking around, I found a solution that works...for me at least and hopefully for you guys.
I had a hard time finding a dialer code that got me to the right menu. This is it. Now, this is, as far ask I know, only for the Tmo version.
*#546368#*918#
Tap Field Test
1. Modem Settings
2. LTE-A CA setting
3. Choose Pcell B4 Scell B17 option
4. Choose Restart Later and hit the back button
5. LTE Band selection
6. Choose Band 12
7. Reboot
(if you still aren't getting band 12, just dial code *#546368#*918# then just do 5 and 6 again.)
I get a solid band 12 connection all the time. This has helped tremendously with battery as well. It's connecting to a much closer tower and not connecting to a band 4 tower a zillion feet away.
Hope that helps!

I am on T-mobile. How do I find out what band I am using? Thanks!

Dialer code doesn't seem to work...
vinyl3131 said:
I know some people were having problems keeping or even getting on band 12 with the V20. The people at T-Mobile were useless, even the engineers. After much poking around, I found a solution that works...for me at least and hopefully for you guys.
I had a hard time finding a dialer code that got me to the right menu. This is it. Now, this is, as far ask I know, only for the Tmo version.
*#546368#*918#
1. Modem Settings
2. LTE-A CA setting
3. Choose Pcell B4 Scell B17 option
4. Choose Restart Later and hit the back button
5. LTE Band selection
6. Choose Band 12
7. Reboot
(if you still aren't getting band 12, just dial code *#546368#*918# then just do 5 and 6 again.)
I get a solid band 12 connection all the time. This has helped tremendously with battery as well. It's connecting to a much closer tower and not connecting to a band 4 tower a zillion feet away.
Hope that helps!
Click to expand...
Click to collapse

fclifton said:
I am on T-mobile. How do I find out what band I am using? Thanks!
Click to expand...
Click to collapse
There's a free app on the play store called Network Cell Info Light.
Just run that and hit the Raw tab and you can see the band.

fclifton said:
I am on T-mobile. How do I find out what band I am using? Thanks!
Click to expand...
Click to collapse
+1 and also how to go back , my speed seems worse now.
edit : well it shows me on band 4 .. hmm
edit 2 : set to airplane mode then back and now its on 12 ...
If it goes back to band 4 , that just means its a better connection?

trobertson said:
Dialer code doesn't seem to work...
Click to expand...
Click to collapse
What's the model number of your phone? Mine is showing LG-H918.
Is that what yours is showing?

vinyl3131 said:
What's the model number of your phone? Mine is showing LG-H918.
Is that what yours is showing?
Click to expand...
Click to collapse
yup. it's a t-mo v20.

I've followed your steps through 4 restarts now and I can't get mine to stick. It switches to Band 12 (verified with LTE Discovery app) after step 6, but once I reboot or go to airplane mode and back, it goes back to Band 4. Any ideas?

Drey070 said:
+1 and also how to go back , my speed seems worse now..
Click to expand...
Click to collapse
Yes that's a common trait of band 12. You get much better coverage but speeds aren't as good. For me, it's still good for what I need plus no dropped calls, awesome connection and no battery drain. Was a worthy trade-off.
Enter the dialer code, modem settings, LTE-A CA, hit the top most option (it'll say all enabled). Back button, LTE Band, band you were on before. Probably band 4.
Or you can just reset network settings and it'll detect everything by itself.

ocelot4ark said:
I've followed your steps through 4 restarts now and I can't get mine to stick. It switches to Band 12 (verified with LTE Discovery app) after step 6, but once I reboot or go to airplane mode and back, it goes back to Band 4. Any ideas?
Click to expand...
Click to collapse
No need to reboot after just doing steps 6 and 7. Should stick.

trobertson said:
yup. it's a t-mo v20.
Click to expand...
Click to collapse
Weird, are you copy and pasting with an accidental space at the end? Make sure the last character is not a blank space but the end actual of the code.

typing it manually.
vinyl3131 said:
Weird, are you copy and pasting with an accidental space at the end? Make sure the last character is not a blank space but the end actual of the code.
Click to expand...
Click to collapse

vinyl3131 said:
No need to reboot after just doing steps 6 and 7. Should stick.
Click to expand...
Click to collapse
Tried it both ways. I was hoping the reboots would help, but no dice. I've been repeatedly selecting Band 12 through the Field Test menu. I'll select 12, then go to the LTE Discovery app, see that it's on Band 4. I'll toggle airplane mode to see if that triggers something, but still no dice. So then back to the Field Test > Select Band 12, rinse and repeat. No matter what I do I can't get it to stick.
What's your network mode setting? Settings > Wireless Networks > More > Mobile Networks > Network mode? I'm using GSM/WCDMA/LTE Auto.

ocelot4ark said:
Tried it both ways. I was hoping the reboots would help, but no dice. I've been repeatedly selecting Band 12 through the Field Test menu. I'll select 12, then go to the LTE Discovery app, see that it's on Band 4. I'll toggle airplane mode to see if that triggers something, but still no dice. So then back to the Field Test > Select Band 12, rinse and repeat. No matter what I do I can't get it to stick.
What's your network mode setting? Settings > Wireless Networks > More > Mobile Networks > Network mode? I'm using GSM/WCDMA/LTE Auto.
Click to expand...
Click to collapse
Yea I'm on auto too. I never restart my phone or use airplane mode so that might be a hitch. Actually, it's kind of a good thing cuz band 4 is always there if you need it.
I'm gonna add the dialer code in my contacts so in case a reboot is called for, can just toggle it back to 12 real quick.

trobertson said:
typing it manually.
Click to expand...
Click to collapse
Just for ****s and giggles, try copying it from my original post and pasting into the dialer. If that doesn't work, that is weird. I'm not sure why it would work for others and not you. Strange.

It's all dependant on what you need. Like I live in Woodstock GA. It's kind of the sticks and I was lucky to get one bar and phone was always hot.
But now getting 5 bars easy.
Just weigh what is most important to you and decide from there. Plus you can always just change the band back to band 4 if you want.

Worked flawlessly. Thanks.

Code not working for me either. I'm definitely Tmobile. I've tried manual and copy/paste. It just disappears.. Thinking it might be something I've frozen.. I'll look.
Nope. Unfroze only thing it could have been in my list and still..

I'm using the 996 unlocked version and I can't seem to set the band ( responds with FAIL). Sad
Sent from my LG-US996 using Tapatalk

T-Mobile h918 here and does not work.
I manually enter code in dialer and hit call and all disappears and no menu. Very odd.

[GUIDE] Increase JIO speed

How to speed up jio connection?
I am posting pre configuration also as well as in case pre configuration not work you can try at your own hit and trial method.
Pre config -
I am not providing any downloadable files or content. This process needs root and volte supported roms. Custom lineage and its based roms still can have issue. It will work best on eui roms ( stock and customs) .
App need -
Net guru (free) - download
1. Download net guru app. And give root access . It will take some time for configuration.
2. Wait untill it shows LTE testing.
3. Now go to menu and select lock bands.
4. Now select LTE and select "B3 1800+" band.
5. Restart and. Enjoy new speed.
Reason to lock only this band -
Coverage + speed too.
Check speed by trai app.
If above method don't work then follow till 3rd step and now select 3 individual bands at which jio works and check your speed at individual bands and lock them at your most preferable band.
Details about bands:
Jio is using 3 LTE bands for 4G:
Band 3 (1800Mhz),
Band 5 (850Mhz)
and Band 40 (2300Mhz)
If LTE Bands are arranged according to services then
Best 4G coverage*: Band 5 > Band 3 > Band 40
Best 4G Speed*: Band 40 > Band 3 > Band 5
Average 4G speed*: Band 40 : 30mbps+Band 3 : 14mbps+Band 5 : 5mbps+
Extra -
1. After Deleting app band locking still works.
2. Restarting doesn't affect band locking.
3. Updating roms or changing also not affect band locking.
4. It's not necessary band 3 will give you more speed or coverage try according to your area. Mine is most suitable at B3.
Working - Sim - up. Working in Delhi, haryana and up.
Post your results.

Thank you bro

If you will use this trick then you both incoming and outgoing call will not work at the time of data connection ,you have to switch to flight mode to enable again

rockingboy said:
If you will use this trick then you both incoming and outgoing call will not work at the time of data connection ,you have to switch to flight mode to enable again
Click to expand...
Click to collapse
No issue here. Receiving calls and everything working fine.

[GUIDE] [FIX] Unstable 4G/3G Network On OxygenOS [No Root]

If you use a OnePlus device specifically a OnePlus 3/3T then there's a really high probability that you've been effected by the unstable network problems(Data network automatically switching to 2G or 3G when the 4G signal becomes a little weak even though the device is capable of receiving the signal) caused when the signal strength is very poor. Even if you select 4G/3G only in the settings the signal becomes 2G.
If you are getting affected by this issue then you can solve this just by installing an app from the play store.
STEPS-
1. Install the app " JOnePlus Tools".
2. Open it and then click on "More Settings" icon on the top right corner.
3. After that click on phone info.
4. In phone info select drop down menu and choose the option, "LTE only" or " WCDMA only" according to your need.
5. Done.
I've been testing it for a few hours now and and haven't faced the issue.
If you are still not able to understand what to do then watch this video, everything done step by step.

But if you choose LTE only when there is not LTE the mobile signal is lost right?

vip57 said:
But if you choose LTE only when there is not LTE the mobile signal is lost right?
Click to expand...
Click to collapse
Yes.

Dial *#*#4636#*#* and in "Phone Information => Set Preferred Network Type:" select compatible settings according to your provider

OP3T Cellular Settings 1.1
Kartike said:
If you use a OnePlus device specifically a OnePlus 3/3T then there's a really high probability that you've been effected by the unstable network problems(Data network automatically switching to 2G or 3G when the 4G signal becomes a little weak even though the device is capable of receiving the signal) caused when the signal strength is very poor. Even if you select 4G/3G only in the settings the signal becomes 2G.
If you are getting affected by this issue then you can solve this just by installing an app from the play store.
STEPS-
1. Install the app " JOnePlus Tools".
2. Open it and then click on "More Settings" icon on the top right corner.
3. After that click on phone info.
4. In phone info select drop down menu and choose the option, "LTE only" or " WCDMA only" according to your need.
5. Done.
I've been testing it for a few hours now and and haven't faced the issue.
If you are still not able to understand what to do then watch this video, everything done step by step.
Click to expand...
Click to collapse
Install app OP3T Cellular Settings 1.1

davoudpro said:
Install app OP3T Cellular Settings 1.1
Click to expand...
Click to collapse
Link?

lover said:
Dial *#*#4636#*#* and in "Phone Information => Set Preferred Network Type:" select compatible settings according to your provider
Click to expand...
Click to collapse
Thank you for sharing

Kartike said:
Link?
Click to expand...
Click to collapse
https://labs.xda-developers.com/store/app/com.ebyt.op3tcs

This does not seem to work any more. I think since Android 8.

I tried the OP3T Cellular Settings 1.1 as suggested, but that didn't seem to work on my OnePlus 3T (Android 8.0.0).
However the Dial *#*#4636#*#* and in "Phone Information => Set Preferred Network Type:" as suggested by @lover, and then using LTE only worked perfectly. Thank you!

Bart9 said:
I tried the OP3T Cellular Settings 1.1 as suggested, but that didn't seem to work on my OnePlus 3T (Android 8.0.0).
However the Dial *#*#4636#*#* and in "Phone Information => Set Preferred Network Type:" as suggested by @lover, and then using LTE only worked perfectly. Thank you!
Click to expand...
Click to collapse
I Have Oneplus 3T Us A3000 Model. I am From India
actually here is the main issue is Volte Related, meanwhile 4g is working internet working super but Volte for calling not working. even i switch on Volte in settings but still they did not work for i try everything.
then i search and got the band issue is here i checked my Network provider using Band 3,5,40.
but in my mobile has band 5. so i unlock rest network bands by Qcn File of CN.
successfully unlocked the all my network provider bands.
but still Volte is not working i try my all efforts and things factory reset, custom rom but still Volte not working for me.
2nd issue
even now only 1 sim can work at a time other network gone out and when i try to search network the error comes (error while searching network)
means dual stand by is not working for me. vice versa same when i switch internet on 2nd sim 1st network gone
even i switch 1 sim on 4G and other on 2G.
?please help me out my Oneplus 3T is down

Switching betwen 2g/3g/4g

Hello
I'm with Leeco Le Pro 3 AI with stock rom 5.9.026s
I notice that my battery drops almost 25 % per 10 hours . Battery used when phone is idle - 30%. The reason for this as I think is that the signal in my place is not so stable so the phone constantly changes between 2g/3g and on some place in 4g.
When I go to settings / Dual Sim $ mobile networks / Network mode i see that it is on auto - ( 2g/3g/4g ( auto) ). The problem is that I can't set it expressly on 2g. There is no option on this settings to choose the type of signal.
If I click on Sim Card slot 1 ( I have only 1 sim card on my slots ) and next click on Netwrok Carrier there is 2 options - auto select and Search for Network. When i go for Search for network i found my local network signals and it shows 2g 3g 4g ... I choose 2g but this do nothing. The phone again is in auto mode ( 2g/3g/4g ( auto) )
So does anybody has any idea of how to expressly set the phone to use exact network carrier ( in my case 2g ) not to be auto?

I believe you can force certain bands by typing this into the LeEco dialer: *#*#4636#*#* and choosing "phone information". Select "GSM only". Use this with caution. Your SIM might stop working because your provider might not support 2G only.

I thought there was an option to choose 2g 3 or 4g separate ???
Like this in the pic:
.

Sweden.33 said:
I thought there was an option to choose 2g 3 or 4g separate ???
Like this in the pic:
.
Click to expand...
Click to collapse
IDK. Just chose GSM only if you want 2G only. Or better yet, pop your SIM into the second SIM slot and you'll only get 2G. Much safer.

sk8223 said:
IDK. Just chose GSM only if you want 2G only. Or better yet, pop your SIM into the second SIM slot and you'll only get 2G. Much safer.
Click to expand...
Click to collapse
But if i want ONLY 4G, how to fix it on le pro 3 ?

Sweden.33 said:
But if i want ONLY 4G, how to fix it on le pro 3 ?
Click to expand...
Click to collapse
EDIT: Whoops, confused you for OP. That's what I get for not reading usernames.

I don't see an option for only 4G - LTE ?
It is only 2g/3g/4g auto.

Sweden.33 said:
I don't see an option for only 4G - LTE ?
It is only 2g/3g/4g auto.
Click to expand...
Click to collapse
AFAIK, it's supposed to give you a bunch of options: https://www.learn2crack.com/2016/01/force-2g-3g-lte-only-mode-in-android.html
Otherwise just choose 2G or LTE as your preferred network type in Settings.
Maybe try an app like this: https://play.google.com/store/apps/details?id=www.extremedroid.com.a4gltetoolkit&hl=en

sk8223 - my settings doesn't allow me to choose between 2g /3g or LTE it is locked on auto! There is no option on my model to choose network type.
Sweeden - I thought so that there is such option just as your screenshot but for Leeco Le Ai there is no such one.
Also there is no option to switch off sim card when you are with only 1 sim card. Actually there is an option - but it doesn't work.
So I will try some kind of app to switch between network type
Leeco Le pro 3 AI has really awful ROM- good hardware but the ROM is the worst I ever used
I badly need a custom rom for this model

sk8223 said:
AFAIK, it's supposed to give you a bunch of options: https://www.learn2crack.com/2016/01/force-2g-3g-lte-only-mode-in-android.html
Otherwise just choose 2G or LTE as your preferred network type in Settings.
Maybe try an app like this: https://play.google.com/store/apps/details?id=www.extremedroid.com.a4gltetoolkit&hl=en
Click to expand...
Click to collapse
Great thankss
the combination *#*#4636#*#* do the job - works perfect !

fxuser said:
Great thankss
the combination *#*#4636#*#* do the job - works perfect !
Click to expand...
Click to collapse
Just to let you know. After restart of the phone you must do it again.

fxuser said:
sk8223 - my settings doesn't allow me to choose between 2g /3g or LTE it is locked on auto! There is no option on my model to choose network type.
Sweeden - I thought so that there is such option just as your screenshot but for Leeco Le Ai there is no such one.
Also there is no option to switch off sim card when you are with only 1 sim card. Actually there is an option - but it doesn't work.
So I will try some kind of app to switch between network type
Leeco Le pro 3 AI has really awful ROM- good hardware but the ROM is the worst I ever used
I badly need a custom rom for this model
Click to expand...
Click to collapse
Have you tried some kind of app that let you choose only 4G and that really works even after the restart of the phone ?

Sweden.33 said:
Have you tried some kind of app that let you choose only 4G and that really works even after the restart of the phone ?
Click to expand...
Click to collapse
No I did not.. but as I see on this thread the link to the app it change the settings on the same place as the call combination *#*#4636#*#* ... So i suppose every app do the same things. But to use this code is not so bad ... from there you can choose, 4g it works!
The bad thing is that my issue with battery drain still exist so i will continue to investigate the problem. Phone in idle consume too much electricity - some **** app sucks my battery energy! Every day I have issue with this phone - it is so time consumption .. bug after bug

fxuser said:
Great thankss
the combination *#*#4636#*#* do the job - works perfect !
Click to expand...
Click to collapse
This works just for a moment for me! Any other tricks that can force 4G LTE even if there are no 4G LTE signal? Thanks
Edit:
Use this instead to force 4G LTE without the ROM changing it back to auto.
https://play.google.com/store/apps/details?id=com.Go.EngModeMtkShortcut
Select "Network Selecting" then change to LTE only. Don't mess with the others, I heard it might destroy your device.

lock to a particular 4GLTE band #noroot

Hey guys. Can any one tell how to select a paricular LTE band (3 or 5 or 40) in asus zenphone max pro without root. Any secret code for that? Dont confuse band selection with network mode selection (2g/3g/4g). I saw solution for rooted phone. But i dnt want to root.

satyajeetb said:
Hey guys. Can any one tell how to select a paricular LTE band (3 or 5 or 40) in asus zenphone max pro without root. Any secret code for that? Dont confuse band selection with network mode selection (2g/3g/4g). I saw solution for rooted phone. But i dnt want to root.
Click to expand...
Click to collapse
How it's done in rooted phones?

SumitGupta2442 said:
How it's done in rooted phones?
Click to expand...
Click to collapse
by an app named as Network signal guru.
Pls somebody tell for non-rooted phones or by adb

satyajeetb said:
by an app named as Network signal guru.
Pls somebody tell for non-rooted phones or by adb
Click to expand...
Click to collapse
Can not be done without root - I am actually trying to discover exactly at what level band locking is done from so I can develop an app just for band locking on Qualcomm chips.
I do know that root is required because we have to interface with the chipset and access phone state as well as RIL manipulation and I think even the network constants.
I am very new to programming but have scoured the code for hours and hours and have a pretty good idea how the modem and os communicate in relation to frequency bands.
NSG is the only app that currently can lock a specific frequency.

You may be able to do it with qxdm. I used it to add lte lte bands on my old lg g2 so you should be able to lock an lte band. Just be careful while using it as u may overwrite/delete important nv values. Google for more details.

satyajeetb said:
Hey guys. Can any one tell how to select a paricular LTE band (3 or 5 or 40) in asus zenphone max pro without root. Any secret code for that? Dont confuse band selection with network mode selection (2g/3g/4g). I saw solution for rooted phone. But i dnt want to root.
Click to expand...
Click to collapse
I use nsg for more than a year... And it's doing band locking job perfectly

I use NSG but it doesn't work flawlessly, it perfectly locks on band 3 and band 5 but can't lock band 40 on this device, all enforcing is cleared after some time after locking it to band 40. It is irritating because band 40 gives the best speed in jio.
Does anyone have any idea how to lock band 40 perfectly?