"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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3answers
3k 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 ...
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 ...
3
votes
1answer
326 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
56 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
75 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 ...
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1answer
6k 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
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1answer
188 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 ...
2
votes
0answers
292 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 ...
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0answers
168 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 ...
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0answers
16 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 ...
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0answers
19 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 ...
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0answers
21 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 ...
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0answers
22 views

Please help me with HTC M8

I bought and HTC ONE M8 at E-bay. according with the seller it have a IMEI problem. When I check with Sprint, they told me that my HTC it is not in the black list but have one of the two IMEI´s ...
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votes
0answers
29 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. ...
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0answers
87 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 ...
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0answers
70 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, ...
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votes
0answers
549 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 ...
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0answers
607 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
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0answers
693 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 ...