Develop Bugs

Roaming with my S3 on Jellybean??HELP??

I frequently run from Toronto to Buffalo. I took my S3 from ICS to Jellybean 4.1.1 and have had no issues until yesterday.
Upon crossing, I lost all service. I tried to go into the menus and see what was the matter without success. Later, I
realized that under MOBILE NETWORKS, Data Roaming wasn't checked. So I checked it off........still no service until
I was about a mile from the border, back on Rogers.
Anyone experience this?? I've bad numerous blackeberry's and cross without an issue all over the US and Caribbean.
I'm confussed.......and concerned about making another trip to the US, without my briefcase which has a backup blackberry
in it........
Suggestions? I fugured that checking the roaming box would have grabbed a carrier..........NOPE.........meanwhile,
my friend who has the same phone still on ICS worked fine................that's the strange part...........
Thanks guys.

Hi!
One thing you could check is if you activated the automatic selection of carrier, and if your phone can see other carriers' networks.
1. Go to Settings.
2. Under Wireless and networks, open More settings.
3. Under Networks, select Mobile networks.
4. Select Network operators.
5. Your phone should now disconnect and search for visible networks. (It should show networks you can connect to and ones you cannot; that is normal.) See if you find any carrier listed on this screen when the search is completed. If no network appear, press again Search networks to scan the visible networks again.
6. Press Select automatically to automatically register to the prefered network. When Rogers is in this list, your phone should register automatically to Rogers. If not, then it should roam on a network with which Rogers has a roaming agreement. You should also be able to manually select to which network you would like to roam by pressing the carrier's name (again, you will register only if Rogers has a roaming agreement with the said carrier).

Happened again this morning. However, I did what you said (here in Toronto) and it found BELL, TElus and Rogers. Now, it
would't find anything across in Buffalo. VERY strange. Called Rogers when I crossed and they were no help.
Could it be possible that it's an issue with Jellybean?? The phone is rooted and I used the Robinson's root injected JB ROM.
Suggestions? I'm crossing again in the morning... Can test more settings.....can't bring my old blackberry because it's a
regular sim and this thing uses a micro...
Alexandre-P said:
Hi!
One thing you could check is if you activated the automatic selection of carrier, and if your phone can see other carriers' networks.
1. Go to Settings.
2. Under Wireless and networks, open More settings.
3. Under Networks, select Mobile networks.
4. Select Network operators.
5. Your phone should now disconnect and search for visible networks. (It should show networks you can connect to and ones you cannot; that is normal.) See if you find any carrier listed on this screen when the search is completed. If no network appear, press again Search networks to scan the visible networks again.
6. Press Select automatically to automatically register to the prefered network. When Rogers is in this list, your phone should register automatically to Rogers. If not, then it should roam on a network with which Rogers has a roaming agreement. You should also be able to manually select to which network you would like to roam by pressing the carrier's name (again, you will register only if Rogers has a roaming agreement with the said carrier).
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[NEED HELP] Signal Strength is 0 in SIM Status

I have been using Nexus 7 (2013) - Cellular for roughly around a year. I use 3G/4G/WiFi for internet connectivity on the tablet.
Since the past one week I have not been able to use the tablet with any 3G/2G sim cards. The tablet only recognises SIMs of a particular provider (lets say "Y" in my case) and that too only for 4G connectivity. This was not the case before and I was able to use SIMs of different providers and on different network modes.
If I insert a SIM other than Y's, the signal strength in about tablet -> sim status is shown as zero.
Also, if I insert a sim other than the "Y" service provider's and search for networks manually the tablet only shows "Y" service providers name and does not even show the actual sim providers/operator's name.
I have tried going to settings and changing the network modes, have tried *#*#4636#*#* settings - these have not worked for me.
Any help on the issue would be appreciated.
Thankyou.

UPDATE: It turns out that I have messed my tablets GSM/UMTS Band modes in the Testing Settings.
I have been able to restore EDGE connectivity on my tablet. However 3G still does not work. I am guessing it's because of the band mode options available to me on CM14.
Tried full reset but it didn't work.
Any help on how to restore my tablet's band mode and get back full 2G/3G/4G connectivity would be really great.

How to set network mode to 4G only?

Please help.. Is there a way to set network mode to 4G only or LTE only?... In settings, I only have the Autoconnect, 2G only and 3G only options.. Thanks..

Is your SIM card already 4G supported? What's your carrier?

The 4G auto connect is available? Apps might be able to access 4636 without root. In there, if there's an option, select phone information, then lock the RAT to 4G only. Alternatively, if *#2263# or *#2683662# is available, in *#0011# select the other SIM if there is any, then in those other codes, band selection, GSM ALL (for the unused SIM), change SIM again with *#0011#, band selection, LTE ALL(for the used SIM). What's expected: If the SIM is not a USIM, the RAT will stay on 3G(UMTS/WCDMA). If the USIM is not authorized, no signal. With soft PLMN locking (manual operator search) the signal level is shown but it's unusable. If the signal is still not available, maybe the phone does not support that band/frequency or no LTE coverage? If rooted it's possible to add LTE only in those settings in feature.xml, if that file is not available others.xml is used. Or launch 4636, or RIL service mode with am broadcast.

Use this app (no root needed). Set to LTE ONLY. Works fine.
play.google.com/store/apps/details?id=com.ather.networkmode&hl=nl

This is worth a try. It's 4636.

ADD THIS IN system\csc\other.xml
<CscFeature_Setting_CustNetworkSelMenu4>LTEONLY</CscFeature_Setting_CustNetworkSelMenu4>
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its very easy. you just need to install this app https://play.google.com/store/apps/details?id=com.teknokia.mtkengineerapp&hl=en and choose LTE Switcher menu. for detail info please go to https://www.teknokia.com/2017/08/how-to-lock-4g-only-or-lte-only-on.html

*#2263#

Force 4G only.

Is there any way we can force cellular network to be 4G LTE only? I want to stop it from automatically switching to H+.
I'm on stock nougat, rooted.

I think you can change it in the hidden service menu. BUT be VERY CAREFUL not to change other things in there.
First make sure your preferred network type is LTE auto, not 3g or 2g only.
Next, go to phone / dialer app.
Enter: *#*#4636#*#*
It should automatically direct to Testing menu, with Phone information, Usage statistics, and Wi-Fi information choice.
Select "Phone information".
Warning: There's many things to see here, but you can easily ruin your radio band in here. Just follow this guide and do not even touch other things.
Go to "set preferred network type"
I'm not sure what it would show for your phone, but for mine it shows "LTE/UMTS auto (PRL)".
Select "LTE only". It should immediately reset your network to 4G.
If it still switches to 3G, then test other options in the "set preferred network type" option.
After finish, exit the hidden menu and clear it from recent apps menu.
Warning: DO NOT CHANGE OTHER VALUES IN THERE IF YOU DON'T KNOW WHAT YOU'RE DOING. IT COULD RUIN YOUR RADIO BAND IF YOU'RE NOT CAREFUL.

Thanks. It worked.

Mobile Data from two Networks Issue; Phone won't use second network

Not sure if I made a wrong setting on my Mi A2 Lite somewhere. I'm new to using 2 SIMS from Network A (TouchMobile in the PH) and Network B (Talk and Text). The phone will only use mobile data from Network A.
I see the setting where I can shut off mobile data for individual Networks, when both networks are ON, the mobile data comes from Network A (regardless if the SIM is in Slot 1 or 2) . When I choose ON for Network A and OFF for B, mobile data still works.
The problem is when I turn OFF mobile data for Network A, and ON for Network B. The Mobile Data icon automatically turns off also and when I press to activate, mobile data for Network A will turn ON also.
I've tried swapping the SIM cards but still same. The only way I can get mobile data to work using Network B is to remove the SIM card of Network A. Thanks in advance for the help.

go to wifi & network - SIM card settings - and select prefered sim card for mobile data

Ah, there it is. Thank you!