"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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3
votes
1answer
4k 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 ...
-1
votes
0answers
17 views

Android Network Mode Change Automation

I am looking for an application that can do automation of network switching for me like when i am connected to my home wifi it should enable 2G (GSM) mobile Data and when the wifi disconnects it ...
1
vote
0answers
125 views

Android error - No SIM card/Emergency calls only

The problem: phone doesn't want to register in network. Android device shows No SIM card. After playing with menu *#*#4636#*#* it starts showing Emergency calls only. Phone displays available ...
-2
votes
1answer
51 views

Can I get GPS coordinates without internet? [duplicate]

am I able to get GPS coordinates for my app with Google Maps API just with GPS and GSM (no mobile internet or Wi-Fi)? Thank You!
26
votes
2answers
7k 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 ...
0
votes
1answer
52 views

How to deal with “short GSM IDs” in Tasker

My "cell near" in Tasker looks like this: GSM:4321.99011048 / 0 GSM:4321.99011052 / 0 GSM:4321 / 0 What is that short ID? If I take it out, my profile sometimes triggers as "leaving" even when I ...
2
votes
2answers
10k views

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

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 ...
3
votes
3answers
5k 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
16k 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?
3
votes
2answers
877 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 ...
1
vote
0answers
80 views

Droid turbo radio off when no signal happen, then can't turn radio back on

I just bought Droid Turbo (XT1225) from ebay, everything works fine except the radio, when the phone receive no signal for example in a lift, radio will turn off by itself and can't turn back on. The ...
0
votes
1answer
547 views

Does OnePlus 2 “DUAL SIM 4G” support dual 4G?

I've read that most dual-SIM phones can only use the other SIM for 2G voice service. Is OnePlus 2 DUAL SIM 4G any different?
0
votes
2answers
827 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 ...
14
votes
2answers
79k 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 ...
0
votes
2answers
145 views

Turn off radio layer hardware calls to save battery when your broadband hardware is gone

With reference to my question here: IM-A870L Radio Interface Layer broke down Summary: My android phone broadband chip is dead. For some reason, its not working anymore. Now I can use the phone for ...
1
vote
1answer
61 views

Moto X (2nd generation) international travel [duplicate]

I want to get a motorola moto x (2nd generation) but I am unsure if the phone can work in other countries outside of the United States, specifically China.
1
vote
0answers
57 views

Will an LG G3 Beat work on Verizon in the US?

I asked on Travel a week ago about getting a temporary phone for a trip to Europe but my requirements have changed. Now I need a phone that works in Europe and the USA. I got to looking at the LG G3 ...
0
votes
0answers
76 views

LG D686 Dual Standby acting like Dual Passive

I have a LG G Pro Lite (D-686) with dual Sim cards. It is supposed to use dual-standby technology, however it works as if it were dual-passive. Specifically, I have a Sim card from Fido (Canada) in ...
0
votes
0answers
62 views

Nexus 5 and T-Mobile USA compatibility

I'm from Germany and I'm planing a trip to USA (Florida). I would like to use a t-mobile USA SIM card in my Nexus 5 (Build LMY47I + FCC ID: ZNFD821). On the T-Mobile site, I found it has to support ...
2
votes
1answer
119 views

How can I know what type of encryption is used by my mobile phone?

I'm interested in finding out what kind of cipher is used on my Android phone. For example A5/1, A5/3 or is the GSM connection unencrypted. I was thinking about sending AT commands to the GSM modem ...
0
votes
1answer
2k 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
898 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
1answer
378 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 ...
2
votes
1answer
726 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
1
vote
3answers
233 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 ...
1
vote
1answer
2k 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 ...
0
votes
1answer
220 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 ...
1
vote
0answers
216 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 ...
3
votes
2answers
1k 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, ...
0
votes
0answers
744 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 ...
3
votes
1answer
372 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 ...
0
votes
0answers
286 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 ...
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 ...
2
votes
1answer
662 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 ...
0
votes
2answers
2k 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 ...
5
votes
2answers
952 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
920 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 ...
2
votes
0answers
295 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
1answer
78 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?