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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.

WiFi Calling not Ringing while Screen Off

So...I am at an office today that I have zero cell coverage since I am in the basement sitting in a network closet. I enabled WiFi calling and I am able to place and receive calls. However, when the screen goes off and the phone locks I do not get any inbound calls. When I call from a land line the call just rings and rings and rings and never gets VM and my cell phone does not ring.
Has anyone else played around with WiFi calling and seen this behavior? I am assuming that WiFi goes into some type of power save mode and disables the WiFi radio when the phone locks.
-CMYLXGO

cmylxgo said:
I am assuming that WiFi goes into some type of power save mode and disables the WiFi radio when the phone locks.
-CMYLXGO
Click to expand...
Click to collapse
Sounds right. I don't have my Sensation yet, and have never had an HTC (gotta switch from my Vibrant this week due to GPS issues), but it looks like this may solve your problem.
Menu > Settings > Wireless and Networks > Wi-Fi Settings
On the Wifi Settings screen, press the Menu button and choose Advanced.

howetechnical said:
Sounds right. I don't have my Sensation yet, and have never had an HTC (gotta switch from my Vibrant this week due to GPS issues), but it looks like this may solve your problem.
Menu > Settings > Wireless and Networks > Wi-Fi Settings
On the Wifi Settings screen, press the Menu button and choose Advanced.
Click to expand...
Click to collapse
Yah...I already tried that. I checked Best Wi-Fi performance and adjusted my Sleep policy to never. Still no dice. I have even noticed that it doesn't always ring right away when unlocked. This is a very poor performing app IMO. It seems to work well if you need to make a call...but inbound is unreliable.
-CMY

cmylxgo said:
Yah...I already tried that. I checked Best Wi-Fi performance and adjusted my Sleep policy to never. Still no dice. I have even noticed that it doesn't always ring right away when unlocked. This is a very poor performing app IMO. It seems to work well if you need to make a call...but inbound is unreliable.
-CMY
Click to expand...
Click to collapse
older issue but may help
http://forums.t-mobile.com/t5/T-Mob...o-Incoming-Calls-while-in-Standby/td-p/835771
userguide incase you don't have it
page 46 of User Manual
Changing Wi-Fi Calling settings
1. On the Wi-Fi Calling screen, press and tap Settings > Connection
preferences.
2. Select a connection option, and then tap OK.
[Wi-Fi Preferred] When you make calls, the Wi-Fi network is preferred over the
cellular network. You must stay in the Wi-Fi range when
calling.
[Cellular Preferred]
When you make calls, the cellular network is preferred over
the Wi-Fi network.
[Wi-Fi Only] HTC Sensation 4G will always use the Wi-Fi network when
you make a call. You must stay in the Wi-Fi range when
calling.
http://pocketpccentral.net/pdfs/HTC_Sensation_4G_UG.pdf
I see you have one thing to do on your list when you unlock your phone LOL

I use WiFi calling at home and I have WiFi set at the default setting, not Best WiFi. I also have WiFi preferred set on my phone. My phone has been sitting for > 1hr with the screen locked/dark and it rang when I called it from my home line. Doesn't seem to be an issue here at all with it not ringing.

carl1961 said:
older issue but may help
http://forums.t-mobile.com/t5/T-Mob...o-Incoming-Calls-while-in-Standby/td-p/835771
Click to expand...
Click to collapse
Seems to be the same issue I had. I'll try and do some testing on my home network tonight.
-CMY

If you use any app like juice defender to control your WiFi make sure it will not disconnect you while your screen is off. May not be your issue but it was mine untill I changed settings. I make and recieve calls just fine now and no missed calls.
Sent from my HTC Sensation 4G using XDA Premium App

One interesting thing I just noticed...I can send and receive SMS while using WiFi Calling
-CMYLXGO

cmylxgo said:
One interesting thing I just noticed...I can send and receive SMS while using WiFi Calling
-CMYLXGO
Click to expand...
Click to collapse
wifi calling shuts off your phone radio & routes everything over wifi

xnifex said:
wifi calling shuts off your phone radio & routes everything over wifi
Click to expand...
Click to collapse
I still see my phone connect or at least check the connection over the network not using WiFi though. My WiFi signal is strong and I'll see the 2G signal pop up for a second and then go dormant again. So something is definitely checking but yeah pretty much everything goes out over your WiFi connection but the radios do turn on from time to time from what I can see.

Seems to be working on my home network fine CMY ..
Can receive and make calls ok ..
I have mine set to ..
1. WIFI Sleep - Never ( However I changed it to 15 minutes then back )
2. Best WIFI Performance
I did notice you have to press the menu key and pick SAVE
to save the settings ..

Seems to work at my other office today. I have it set to WiFi Perfered. The only differnce here is that I actully get GSM signal in most of the building. Anyways...I'll do more testing when time permits and report back my findings. Thanks for all those that chimed in.
Now just need to get GPS to lock in a resonable time frame.
-CMY

carl1961 said:
older issue but may help
http://forums.t-mobile.com/t5/T-Mob...o-Incoming-Calls-while-in-Standby/td-p/835771
userguide incase you don't have it
page 46 of User Manual
Changing Wi-Fi Calling settings
1. On the Wi-Fi Calling screen, press and tap Settings > Connection
preferences.
2. Select a connection option, and then tap OK.
[Wi-Fi Preferred] When you make calls, the Wi-Fi network is preferred over the
cellular network. You must stay in the Wi-Fi range when
calling.
[Cellular Preferred]
When you make calls, the cellular network is preferred over
the Wi-Fi network.
[Wi-Fi Only] HTC Sensation 4G will always use the Wi-Fi network when
you make a call. You must stay in the Wi-Fi range when
calling.
http://pocketpccentral.net/pdfs/HTC_Sensation_4G_UG.pdf
I see you have one thing to do on your list when you unlock your phone LOL
Click to expand...
Click to collapse
still helping out and dont have the sensation?! ur the man CARL like seeing the familiar faces from the old thread....CMY/CARL/WARLOCK

cmylxgo said:
Seems to work at my other office today. I have it set to WiFi Perfered. The only differnce here is that I actully get GSM signal in most of the building. Anyways...I'll do more testing when time permits and report back my findings. Thanks for all those that chimed in.
Now just need to get GPS to lock in a resonable time frame.
-CMY
Click to expand...
Click to collapse
cmy,
Have you had any luck solving the wifi calling or GPS lock? My Sensation takes forever to get a GPS lock (if at all sometimes) - way slower than a friend's G2. I've had luck setting the wifi calling to cellular preferred. That seems to have helped me, based on what testing I can do. In your case you need wifi preferred and I'd like to be able to use that option too. Is it possible your office (and mine) is blocking something on the wifi network that is preventing it? At home, I haven't heard of anybody calling me and it not ringing - just at work.
yyzfan

Wifi calling = FAIL unless with google/voice.
Tell your provider to suck less and reinvest.

Wifi calling is working great for me...I have no reception at my house wifi calling has been a savior. I use the same settings that warlock mentioned earlier
Sent from my HTC Sensation 4G using XDA Premium App

Thanks. I'm going to write it off as my office blocking a port that wifi calling needs, or something like that. I have mine set to prefer cellular and that seems to make it function at work. At home, where I live in a T-mobile deadzone, it seems to switch over to wifi properly.

Will you use roaming when on airplane mode?

I am leaving the country.
Do I need to remove the sim card or does airplane mode stop all data???
I don't want to have any crazy charges on my next bill.
I just want to use WI-FI when I am gone. If their WI-FI networks are open.
I am leaving in the morning. I do not need to make any calls.
Sent from my LG-P999 using XDA Premium App

You will get absolutely no radio connection of any kind on airplane mode.
Sent from my Nexus Prime using XDA Ultimate App

If you want to use wifi you cannot use Airplane mode. Go into Settings, Networks & wireless, Mobile networks and uncheck the "Data enabled" and "Data roaming" boxes. Now it will use Wifi only and the phone will still work also (mobile network data will be completely turned off).

jboxer said:
If you want to use wifi you cannot use Airplane mode. Go into Settings, Networks & wireless, Mobile networks and uncheck the "Data enabled" and "Data roaming" boxes. Now it will use Wifi only and the phone will still work also (mobile network data will be completely turned off).
Click to expand...
Click to collapse
Maybe I'm wrong, but if I remember correctly, if I go Airplane mode, then go into Settings>Networks & Wireless, and turn wifi on, I still get the airplane signal, but can use wifi..

flight mode mod?

Is there a way to configure the flight mode?
Actually the flight mode turn off GSM signal - wifi - bluetooth
I would like to have the choice of what I turn off (or at least only turn off the cell signal and keep my wifi active)
any idea?
Thanks a lot

Root your phone and install cm7 which has settings to choose when wifi enabled then disable data
CM7 SkyRocket

thanks but CM7 is still in alpha and I rather wait for a stable version

floppy__ said:
I would like to have the choice of what I turn off (or at least only turn off the cell signal and keep my wifi active)
any idea?
Thanks a lot
Click to expand...
Click to collapse
One option: Menu.... Settings... Wireless and networks... Mobile networks... and uncheck "Use Packet Data". This will shut off your data connection. Also, take a look at JuiceDefender Ultimate in the Market.... tons os settings to control WiFi and data automatically.

DoctorQMM said:
One option: Menu.... Settings... Wireless and networks... Mobile networks... and uncheck "Use Packet Data". This will shut off your data connection. Also, take a look at JuiceDefender Ultimate in the Market.... tons os settings to control WiFi and data automatically.
Click to expand...
Click to collapse
Thanks but in fact it's not my data connection I want to shut off, it's my voice connection. Where I work I have no signal but they have a good wifi, I use Groove IP to receive and make call with google voice.
I want to be in airplane WITH wifi just to keep my battery

Turn off Mobile network without turning airplane mode on!

Hi
Is it possible to Turn off Mobile network without turning airplane mode on?
Want to be able to use wifi to sent messages etc & not my mobile network

deleted

jt1998 said:
I have this setup currently. I use quickshortcut maker LINK from the play store. When you open the app, it default to incremental search. Type in data usage and several results pop up. In there is settings. Under settings, is the 2nd choice called data usage. Choose it, and the next screen lets you try the shortcut you're making. Click it and it should bring up your mobile data screen where you can toggle the data on/off with just one button! PRESTO!!
Enjoy.
Click to expand...
Click to collapse
Turning mobile data off is not the same as aeroplane mode - your cellular radio is still active and you can send and receive calls and SMS messages.
Assuming the OP really wants no cellular radio, what they need to do is switch on aeroplane mode, and then switch WiFi back on again.
Regards,
Dave
Sent from my Pixel 2 XL using Tapatalk

There's a toggle for it in the drop down menu, or am I missing something?

RazoE said:
There's a toggle for it in the drop down menu, or am I missing something?
Click to expand...
Click to collapse
Not mobile data! mobile phone calls is what i want to turn off, so i can use wifi calling!

priisek said:
Not mobile data! mobile phone calls is what i want to turn off, so i can use wifi calling!
Want to be able to use wifi to sent messages etc & not my mobile network
Click to expand...
Click to collapse
Not what you had specified.

RazoE said:
Not what you had specified.
Click to expand...
Click to collapse
I asked how to turn off network? not mobile data. two different things!

priisek said:
I asked how to turn off network? not mobile data. two different things!
Click to expand...
Click to collapse
As I said earlier, you need to switch on aeroplane mode, and then turn Wifi back on again.
You can switch on both Wifi and Bluetooth when aeroplane mode is on.
Regards,
Dave
Sent from my SM-G955F using Tapatalk

foxmeister said:
As I said earlier, you need to switch on aeroplane mode, and then turn Wifi back on again.
You can switch on both Wifi and Bluetooth when aeroplane mode is on.
Regards,
Dave
Sent from my SM-G955F using Tapatalk
Click to expand...
Click to collapse
Is there any other way than airplane mode, dont want to be in there as it stops other thinmgs on my phone which i still want on thanks

I do not know what you mean
I do not know what you mean

Hello. More details please... Why do u want cell data off? If you set up wifi calling and use the preferred call method of wifi calling you don't need to do what your trying to do.
TRY THE FOLLOWING.....
Turn on Wi-Fi and connect to a Wi-Fi network.
From the Home screen, swipe up on an empty spot to open the Apps tray.
Tap Settings > Connections.
If necessary, slide the Wi-Fi switch right to the ON position.
Tap More connection settings.
Tap Wi-Fi Calling, now Select one of these options:
Wifi preferred
Cellular network preferred
Never use cellular network
Choose never use cellular network, and when u have a wifi connection your phone will use wifi calling not your carrier network.
This is how you do what your trying to accomplish I believe.