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[Q] How do I prevent Samsung Galaxy S 4G from connecting to AT&T?

I have Samsung Galaxy S 4G with T-Mobile in San Francisco.
Whenever I go to an area without T-Mobile signal, the phone connects to AT&T. I called T-Mobile and they said that's because T-Mobile has roaming agreement with AT&T so my phone would connect.
The problem is, when my phone connects to AT&T, I can't make any calls. It says the phone's not registered. T-mobile says that's because I'm in an area that has T-Mobile coverage.
You'd think that the phone would be smart enough to figure out that only emergency calls can be made (which is what BlackBerry does and shows SOS sign). The real problem for me is that, I have WiFi calling enabled with cellular preference, and when I'm in the basement of my office building where there is no T-Mobile signal (but there is WiFi signal), my phone thinks it has cellular signal so it doesn't activate WiFi calling, yet no phone calls are coming in b/c it's not registered to AT&T's cellular network.
Is there a way for me to force my phone to only connect to T-Mobile? I know there isn't on the regular settings menu, but perhaps experts could tell me how to do so using those star-sharp keys listed here (http://forum.xda-developers.com/showthread.php?t=842134)?
Thank you!

Set wifi preferred instead of cellular.
Sent from my SGH-T959V using XDA App

Unfortunately, that doesn't work for me because I move around a lot, and Android WiFi calling feature doesn't have handover.
There's got to be a way to prevent this phone from connecting to AT&T at a low level somehow, no?

How do I do that? Have checked the manual but can't find location where explains how to select wi-fi preferred instead of cellular. Your kind advise will be appreciated

Open WiFi Calling and select settings. You'll see Preference. Select Cellular Preferred.

I think in setting then wireless and network, then mobile networks then network operators click the default settings.... select manual and wait for the carrier to pop up.
Will this solve your problem?
Sent from my SGH-T959V using XDA App

scoop_dtx said:
I think in setting then wireless and network, then mobile networks then network operators click the default settings.... select manual and wait for the carrier to pop up.
Will this solve your problem?
Sent from my SGH-T959V using XDA App
Click to expand...
Click to collapse
yep manual is exactly what OP should do.

if the settings for network operators are set to manual then u select the network u want and it sticks unless u manually select a different network provider. u are in select automatically mode so the phone can switch all on its own. this should solve your problem as other people have already mentioned

I have tried this many times and works as long you don't turn the phone off. After I forced the phone to manually select T-Mobile I checked many times the default setting and it remained in manual until the phone was turned off. When I switched it back on it was again in automatic mode and switching to ATT when signal is low.
Is there a way to prevent this? If not, well , first thing when phone is on in the morning is to check default setting.
5/24 I finally gave up and sold the phone. Samsung says they have not received any claims regarding this issue eventhough you see it frequently in the forums. I returned back to my HTC HD2 and will wait for the G2.

[Q] Just got this phone and my data doesn't work?

Hi I just got this phone as a replacement for my Sony Ericsson X10a.
I have AT&T and when I try and use my data I can't connect I can only use Wifi I see "4g" by my signal up top but it doesn't work.
When I look at my access point names I see 4 of them.
AT&T US AAB
AT&T US HSDPA
AT&T US Tether
AT&T US MMS
To the left of them is a lock icon and they are locked.
3 of them are able to be toggled but none work.
So do i need to reenter the APN's? If so does someone have the inputs?
Also should I fix this is there a good data switch widget I can use for this phone?

Try this:
Go to Settings - > Battery and Data Manager - > Data Delivery
Make sure Data Enabled is checked.
I've had it mysteriously uncheck for me before on this phone.

^ +1 to that.
Is the 4G symbol gray or blue in color?

Moverf16 said:
Try this:
Go to Settings - > Battery and Data Manager - > Data Delivery
Make sure Data Enabled is checked.
I've had it mysteriously uncheck for me before on this phone.
Click to expand...
Click to collapse
Yes it's enabled.

It's is gray meaning no connection.

Go to About Phone - > Phone Status
What does it say under Signal Strength, Mobile Network Type, and Mobile Network state?

Problem solved was not an issues on my end AT&T did not register my replacement in the system so they thought I was still using an X10a. The Atrix 2 is now in the system and my phones data works!

Good to hear!

Atat had to do the something basically they didn't recognize it then I called and enrolled me in there 4g data plan
Sent from my speedy Motorola atrix 2

Exactly the same thing I had happen. X10 finally flashed to death. They replaced it with ATRIX 2 but didn't change me over.
Sent from my MB865 using Tapatalk

hellsrage619 said:
It's is gray meaning no connection.
Click to expand...
Click to collapse
Not true... The blue indicates a connection to Google servers not to the internet, therefore you could still be connected to the internet if it's gray.

[Q] Disable Roaming "R" icon in status bar.

I am using an MVNO (Mobile Virtual Network Operator), so I have always had to activate "Data Roaming" in order to be able to establish a connection over the mobile data network.
Usually in my S3 which i was using before, I could see a sign next to the reception gauge which indicated me which mobile data standard my device was using at the moment (H+/E/G), even when I was roaming at these times.
Nowadays on my new Nexus 5 with stock Android 4.4 I am justing being shown the "R" sign next to the gauge, without any indicator for the standard it is using at the moment (LTE/H+/E/G).
Is there a way to disable the roaming indicator ? can anyone tell me or create a xposed module for the same if possible ?
thanks in advance. it is such a small issue but its annoying since i dont get full connection always and want to check whether i am getting 2g or 3g

Are u using Lycamobile?

Which country & network are you in?
My operator is a MVNO in the UK, but don't get the Roaming flag.
That said, when I was living in India if I travelled to a different state it would behave as you're saying - so wonder if it's more related to that than the fact it's an MVNO?

Yes am using Lycamobile and I live in Virginia, USA
Sent from my Nexus 5 using xda app-developers app

premsurya said:
I am using an MVNO (Mobile Virtual Network Operator), so I have always had to activate "Data Roaming" in order to be able to establish a connection over the mobile data network.
Usually in my S3 which i was using before, I could see a sign next to the reception gauge which indicated me which mobile data standard my device was using at the moment (H+/E/G), even when I was roaming at these times.
Nowadays on my new Nexus 5 with stock Android 4.4 I am justing being shown the "R" sign next to the gauge, without any indicator for the standard it is using at the moment (LTE/H+/E/G).
Is there a way to disable the roaming indicator ? can anyone tell me or create a xposed module for the same if possible ?
thanks in advance. it is such a small issue but its annoying since i dont get full connection always and want to check whether i am getting 2g or 3g
Click to expand...
Click to collapse
Hi,
I have the same problem in Spain, also using a VMNO and on stock ROM I also get the R.
When I was using customer made roms (Cyanogenmod or AOSP based) this did not happen as in the settings menu there was an option of setting National Roaming.
I am using another different device than yours (Xperia V), but it is a common problem. If anyone knows a solution, perhaps with an Xposed Module, or whatever it would be very helpful
Thanks

Same problem, I miss the data indicator while roaming
This app helped to solve my problem. It's a network monitor but it also indicates on which data network you're on.
It's called "2G 3G 4G LTE Network Monitor" available in Play Store

I have a similar problem. Not on an MVNO, but I'm using an unlimited Telmex plan in Mexico, which give lets me use my phone and data normally when roaming in Canada and US, so i really don't care to know that on roaming, but i would like to know what sort of data connection i have, if any.

[Q] 3g issue

Hello there, i just got this phone 3 weeks ago and since i have wifi i didnt test the 3g conection before. i activated a data pack and i just realized that my 3g doesnt come on at all. the screen shows 4g left side of the signal strengh but it doesnt work at all. i got at&t version. i confirmed with my carrier and i did activate data, they even helped me to set up the apn but is still not working. can you helpe me? thanks!
PD: they said they couldnt have done more because they dont support that type of device

Does it say 4G or 4G LTE? The at&t icons are a bit different I'd you're not used to them.
4G = hspa
4G LTE = LTE
So if you're getting the 4G icon you are actually getting 3G hspa speeds.
Sent from my Evita

If another carrier besides AT&T, you will need to find the APN settings for your carrier and manually enter it into Settings>Mobile network settings>Access point names. Select "New APN" and enter the correct settings for your manufacturer.
The 4G icon simply means a network is present, it doesn't mean you are connected to it.

thank you for helping people. whel actualy i wouldnt mind getting 3g network access, the point is that i dont have internet access at all. i called my carrier (Claro - El salvador) and they helped me to set up the apt but is still not working. i was wondering if there is something else i could try to fix this

nevermind, i finally fixed it

Please share the fix so the information is available for anyone who might have the same problem in the future.
Sent from my Evita

Please share the fix so the information is available for anyone who might have the same problem in the future.
Click to expand...
Click to collapse
sorry. well, first i did master reset, once done i set up an apn (carrier provides you with this info), then went to mobile network > network operators > select automatically. once the device found the "CLARO" network i turned data on and got internet service.

Thankyou, these threads live on long after we're finished with them so it's important to have the information readily available for future troubleshooters.
Sent from my Evita

tolonuia said:
sorry. well, first i did master reset, once done i set up an apn (carrier provides you with this info), then went to mobile network > network operators > select automatically. once the device found the "CLARO" network i turned data on and got internet service.
Click to expand...
Click to collapse
I'm guessing you either had not entered the APN info exactly correctly the first time. Or also, after entering the APN you actually have to select it as the "active" one on the list of APNs (making sure it has the colored dot next to it). Maybe it did need a factory reset, but this shouldn't be necessary just to change APN.
Happy you got it figured out.

Can't turn on data using the Verizon G5 on AT&T?

I just bought a used Verizon LG G5 (VS987), however my carrier is AT&T. After putting in the Sim card, calling and texting works but when I go to turn on mobile data in the settings, I get a popup that says "Add Mobile Service Please contact Customer Service at (800) 922-0204 for assistance."
I have called both that customer service number for Verizon ^ and also AT&T. I made sure that my IMEI was updated on our AT&T plan, and I have the right APN settings put in. When I called Verizon, the guy didn't really have much to say except that the device is unlocked but full access to features can't be guaranteed, and I am aware that Verizon and AT&T use different wireless bands, which he explained, but I should be able to at least have some kind of data. We both agreed that this is just some piece of Verizon software keeping me from using data, and he suggested rooting the phone to get a workaround.
One suggestion that I saw in some forums and tried was that resetting the network settings in Backup and Reset does turn mobile data on by default, however I get the same Verizon popup as soon as I open any browser, and other apps just say there is no connection, although when I do this I can see that I am getting either HSPA or 4G data, it just seems like it's being blocked by this Verizon stuff. Messing around with other setttings such as Data roaming and System select didn't change anything.
Does anyone have any experience using a Verizon G5 on AT&T? I saw a video of someone demoing T-Mobile 4G data on the Verizon model, and another user on XDA said that he put in his T-Mobile sim and it worked perfectly. My best guess on where to go from here is to unlock and root, and see if I can install a custom rom to get around this. Does anyone know if there is a stock LG rom without all of the Verizon bloatware installed, maybe a stock rom for the unlocked model of the G5? Any suggestions on how to get this to work are appreciated, and I think this is posted in the right place, I'm an active reader on XDA but this is one of my first posts
Thanks to anyone that reads all of this!

Update: I reset the phone to factory settings and set it up with the sim card from AT&T in it. Since then I can turn on mobile data, and the notification bar shows I have data (mostly HSPA), however I have no connection when I try to load a webpage. Tomorrow morning i'll stop by the AT&T store and see if there's anything they can do.

jayscoottey said:
Update: I reset the phone to factory settings and set it up with the sim card from AT&T in it. Since then I can turn on mobile data, and the notification bar shows I have data (mostly HSPA), however I have no connection when I try to load a webpage. Tomorrow morning i'll stop by the AT&T store and see if there's anything they can do.
Click to expand...
Click to collapse
Did you add the correct APNs for AT&T in the phone when you put in your sim? you need it for internet and MMS
Did you which it to Gobal or other option that is not LTE/CDMA?

Same problem here
jayscoottey said:
Update: I reset the phone to factory settings and set it up with the sim card from AT&T in it. Since then I can turn on mobile data, and the notification bar shows I have data (mostly HSPA), however I have no connection when I try to load a webpage. Tomorrow morning i'll stop by the AT&T store and see if there's anything they can do.
Click to expand...
Click to collapse
Was your problem solved? I'm having the same problem with another Verizon LG Device. If it was solved, what did you do?