"Global System for Mobile Communications". Used by phones on most carriers, but is specific to the make of phone. Most AT&T phones, for example, are GSM.

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24
votes
2answers
6k views

Can I use my device on a different carrier?

Sometimes it's desirable to use a device on a carrier that does not officially sell it. Often this is due to regional differences and travel (for example, using a US phone in Europe) but also because ...
13
votes
5answers
34k views

Can the Nexus 7 send and receive GSM texts and calls?

The Nexus 7 3G is out and I'm wondering whether Android 4.2 tablets are still data-only devices. Can I install a custom ROM or apk to this tablet so that I can send and receive GSM calls and text ...
12
votes
2answers
70k views

How to tell current frequency band?

I have a Samsung Galaxy Ace, with quad-band I believe. It is possible to see the current connection network type, e.g. UMTS, EDGE, etc, by going to Settings -> About Phone -> Status. But it does not ...
1
vote
1answer
13k views

How can I enable field test mode on Samsung Galaxy S3?

I have a Samsung Galaxy S3. Are there any codes to enable field test mode, like band selection? Has someone managed to enable such an option?
0
votes
2answers
578 views

Cyanogenmod no service?

I had cm-11-20150517-NIGHTLY working, then upgraded to cm-11-20150607-NIGHTLY. Now I get the error "No service" and have basically no GSM functionality whatsoever. If I attempt to select a network ...