"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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19
votes
2answers
3k 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 ...
12
votes
5answers
31k 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 ...
11
votes
3answers
34k 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 ...
5
votes
2answers
579 views

Is it possible to turn of the GSM radio and still use data connection?

I recently starting using a Samsung Galaxy S4. I need to use a special phone at my work. For that purpose I have a duo card where I turn off one phone to use the other. The problem is that I can ...
3
votes
1answer
707 views

Sony Xperia Play CDMA to GSM

I have an Xperia Play that was originally with Verizon and therefore using CDMA. I want to use it with the Rogers network now. I've read that the Qualcomm chip inside supports both types of networks ...
3
votes
1answer
488 views

Foreign phone, stuck on 2G

I am currently working on a Coolpad 8150, a Chinese phone running Android 2.3.7. It is connected to T-Mobile (in the United States) and can place calls successfully. However, it is stuck on 2G. I have ...
3
votes
2answers
836 views

Is there a way to switch between radio modes without the phone radio completely shutting down?

Is it possible to have the radio switch between WCDMA Preferred mode, GSM mode, and WCDMA only, for example, without the radio switching off and on again? The radio completely loses signal during the, ...
3
votes
1answer
299 views

Cannot receive calls but can make calls on my tablet HCL ME Y2

I recently bought a HCL ME Y2 tablet with Android 4.0.3 (Ice Cream Sandwich) installed. It has a SIM slot and when I use the Phone dialer (the blue phone icon app), I can make calls over GSM but when ...
2
votes
1answer
283 views

Why isn't there any encryption application on GSM calling?

I just wondering the reason why there is no encryption tool for GSM calling in android. Is it legal or technical problem? Thank you
2
votes
1answer
286 views

How to switch the GSM/3G module off?

I only use my smartphone (Samsung Galaxy Chat) as a "pocket computer" (with WiFi) and don't use it to make telephone calls (I use a dual-SIM "dumbphone" for this). All the time it shows a cellular ...
2
votes
1answer
69 views

Google play login different GSM carriers

I moved to the USA from Kenya with my android handset, but am unable to log in to google play on my new network, T-mobile. Can anyone help me fix this?
2
votes
1answer
3k views

Can't tell if HTC One V is GSM or CDMA

I recently won an HTC One V and I want to sell it, but I'm not sure what carriers it supports. I won it from an HTC stand I went to, and all they said was that the phone was unlocked so that it could ...
2
votes
0answers
289 views

How to unroot a GSM Galaxy Nexus without reverting to the stock ROM

I recently rooted and unlocked the Bootloader on my Galaxy Nexus — direct from Google — using this method. Upon doing so my phone reverted to the stock Jelly Bean ROM I had just after upgrading. All ...
2
votes
3answers
2k views

My phone not registering to 2G (GSM only) network

I am using a Sony Xperia Neo L (MT25i). After updating the OS, my phone not registering to 2G (GSM only mode) network. It works perfectly with 3G (WCDMA only or WCDMA proffered mode) network. While ...
1
vote
1answer
772 views

GSM signal lost - howto get signal back without restarting

Several times a week I have the problems where the GSM signal is lost on my phone, due to bad coverage in that area. The real problem for me is that when that happens, and when I move to a place with ...
1
vote
0answers
149 views

Android phone not detecting mobile operator

I've this problem with my new Sony Xperia L Android phone running on Jelly Bean. The phone has been working well for one week now, but as of recently, when I turn on the phone, it doesn't connect to ...
1
vote
0answers
127 views

Check network availability using phone's modem (low level)

I am trying to find network availability using my phone's GSM modem. Last night I had almost done it using following procedure with adb shell connecting phone with Ubuntu laptop. Terminal 1 ./adb ...
0
votes
1answer
77 views

GSM vulnerabilities

I heard that there are inherent flaws in the GSM protocol that make it possible for someone to impersonate a network operator and do all sorts of nasty things remotely, even if your phone is off. Is ...
0
votes
2answers
838 views

How to use Android modem without using PC

I have rooted my mobile. I wanted to use modem of Android phone without connecting to PC. How to give AT commands without connecting to PC, because in http://atinout.sourceforge.net/, it is suggesting ...
0
votes
3answers
81 views

Can GSM operator affect battery life?

I am using samsumg galaxy s3 mini. Couple of days ago, I changed the GSM operator I am using which has more signal strength and internet speed than old one. But I realized my phone's battery life ...
0
votes
1answer
3k views

Can I use an unlocked T-Mobile Galaxy S5 on AT&T?

I made the unfortunate mistake of buying a Galaxy S5 through AT&T and was rewarded with a locked bootloader and no fun whatsoever for any reason ever. As a remedy, I've considered purchasing a ...
0
votes
0answers
17 views

GSM International Galaxy HELP

I have a GSM Unlocked Galaxy MEGA, but it's all in Chinese letters. I factory reset the phone but it still had the chinese apps and everything. It is also missing some device apps like the Play Store. ...
0
votes
1answer
37 views

Is it possible to call AT-commands in android? [duplicate]

I am newbie in android, I have a very simple question for android experts:- " Is it possible to call GSM AT-Commands in android just like we use in microcontroller programming through USART".
0
votes
0answers
39 views

Difference between GSM/Sprint/Verizon

Sorry, stupid question: How can I tell whether my Samsung Google Nexus is Sprint, Verizon, or GSM? I can't turn on my phone (bricked), so this guide is useless to me (or at least I really don't ...
0
votes
1answer
1k 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
0answers
31 views

How to debug outgoing SMS's?

My phone isn't able to send messages any more and receives CMS error 21, which indicates that my provider is blocking them for some reason. It looks like I'm out of money, while this isn't the case, ...
0
votes
0answers
360 views

GSM Rom To CDMA Rom

I have a marvelc (HTC Wildfire S CDMA) and was wondering if there is a way to convert GSM roms (for the marvel) to CDMA (for the marvelc). This rom looks nice but its for the marvel, not marvelc. I ...
0
votes
0answers
285 views

Verizon GSM SIM card for unlocked Samsung Galaxy S2 [duplicate]

I have an unlocked Samsung Galaxy S2. I bought it from Bangladesh. It has been working well with any Bangladeshi GSM SIM card. I just arrived in USA. Is it possible to get a Verizon GSM SIM card for ...
0
votes
0answers
453 views

XYZ X1 Change band from 900 to 850

I just bought the XYZ X1 Android phone with GSM: 900/1800MHz, WCDMA 2100 MHz Unfortunately in my country are 850/1900MHz frequences. Is it possible to change the band on this phone? I've tried to ...
0
votes
0answers
579 views

android network provider always returns longitude value as -1.0E-5 but latitude value seems ok (e.g. 37.56003)

One android LBS app on HTC wildfire A3366 (G8) with android v2.2 (including google GMS service package), while using the GSM SIM card of China Mobile always runs great to get valid network geolocation ...
0
votes
1answer
153 views

Issue in GSM for Straight Talk and MMS.

I just purchased a GSM unlocked Android phone. And called into Straight Talk to get the new APN setting. But, the settings they gave me would not allow me to receive MMS. The web and testing ...