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Questions tagged [gsm]

"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.

30
votes
2answers
8k 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 ...
23
votes
4answers
139k 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 ...
14
votes
5answers
35k 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 ...
5
votes
2answers
1k 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 ...
4
votes
2answers
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
1k 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
2answers
1k 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
2k 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
418 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 ...
3
votes
3answers
9k 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 ...
2
votes
1answer
1k 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
1k 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
93 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
53 views

LTE: Lost/Stolen Phone in another country, didn't receive text/data/voicemails after new SIM?

I had an unfortunate situation occur to me where my phone was pick pocketed out of my pocket while on Vacation out of the country. We decided to not cancel the phone line because doing so would ...
2
votes
0answers
1k views

Acceptable Signal Strength Ranges for 2G/3G and 4G

I have been logging signal strengths on my phone and am trying to understand what ranges can be considered "Good" and "Bad". RSSI is a measure of signal strength for GSM (2G/3G): -50dBm to -113dBm ...
2
votes
0answers
643 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 ...
2
votes
1answer
453 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 (/...
2
votes
0answers
320 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 ...
1
vote
1answer
1k views

Is it possible get caller’s cell tower information?

I had read somewhere that the caller’s cell tower information is sent to the receiver of the call. Is it true because I can’t find any details regarding this online? If this is true why are there no ...
1
vote
2answers
1k views

Getting around a tethering block with European prepay SIM

When I travel to Europe, I buy a SIM, stick it in a Moto-E that has a European radio, then tether my regular cell phone. This has been an effective solution since I'm using my regular phone, and I ...
1
vote
1answer
209 views

Locate phone without GPS

I was thinking what would be the best way to locate a stolen motorcycle. The simplest solution I tough of was to hide a small smartphone inside the bike and use it to locate it. The problem is that ...
1
vote
3answers
893 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
62 views

Will this “SIM Free” Android phone for sale near Osaka (Japan) work in Europe and North America?

Will this "SIM Free" Android phone for sale near Osaka (Japan) work in Europe and North America? Hello, So my phone recently went temporarily out of order and then I saw this Asus ZenFone 3 for sale ...
1
vote
1answer
602 views

Tasker/Security Settings 2G switch not working on OnePlus X CM13

I'm stuck with my planned automatization with tasker and security settings. My idea is to automatically switch to 2G/GSM when I connect to a WLAN. When disconnecting I want to switch back to 3G/4G. I'...
1
vote
1answer
30k 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?
1
vote
2answers
13k 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 T-...
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 ...
1
vote
0answers
24 views

Is phone call quality different depending on the connectivity standard?

I've been trying to figure out how to achieve the best audio quality in phone calls, and part of it is finding out whether GSM, CDMA, LTE or other standards/technologies compress the audio the same ...
1
vote
0answers
120 views

Using an Android phone to pass through a dial-up modem signal

I have a Samsung Galaxy A5 (2016) and an old laptop with a built-in dial up modem. I would like to know if there is any way to connect the modem to my mobile and use it to pass through the modem ...
1
vote
1answer
309 views

OnePlus 3 - 2G (GSM) network not working - Selected network (o2 - cz) unavailable

I have a weird Issue with my brand new Oneplus 3. It's not connecting to 2G network, or it connects, but calling/data does not work. when switching from 3G to 2G, it registers to network, even shows ...
1
vote
1answer
551 views

Can the Nexus 6P use GSM data if the connected Wifi has no route to the internet?

I have a Nexus 6P and use it to connect to a Phantom 3 4K drone using WiFi. Obviously, because it's a private WiFi network with no external connectivity my phone can not contact the internet via WiFi. ...
1
vote
0answers
85 views

Switch sim cards?

Up to about 3 weeks ago, I had a Motorola Moto X running Android 5.1 with Verizon/CDMA . Then I switched to a Nexus 5 running Android 6 with Ting/GSM. The Ting service is terrible it turns out, so I ...
1
vote
0answers
4k 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 ...
1
vote
1answer
140 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
135 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 ...
1
vote
0answers
249 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
2answers
16k views

Brand new Moto G6 won't send or receive SMS

My brand new out of the box Moto G6 won't send or receive SMS. I'm using the official SMS app which has SMS permissions (triple checked this) and is the default SMS app. I tried everything: cleaning ...
0
votes
1answer
656 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
3k 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
2answers
5k 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
1answer
105 views

I'm with Virgin Mobile; should I buy Unlocked or Sprint-locked?

I'm looking around at buying a Samsung Galaxy S5, and learning quite a bit about what GSM and CDMA are while I'm at it. In that respect though, I have no idea what Virgin Mobile is, though I know ...
0
votes
1answer
94 views

foreign phone stuck at Edge [closed]

I have Samsung galaxy j2 ( j200h/ds). Phone is supposed to connect to 3g but it never does. My current network is T-Mobile.
0
votes
2answers
559 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 ...
0
votes
0answers
65 views

Unblocking Caller ID transmission per address book contact - CLIR

this question is about CLIR (calling line identification restriction). on a mobile device you can "globally" enable or disable CLIR. per default i want to block my caller ID transmission. but for ...
0
votes
2answers
53 views

Can an Indian GSM phone be used in the USA?

I'm considering buying the Oppo F9 Pro, which has a dual sim GSM slot. I currently have consumer cellular service with a nano GSM sim card. would I be able to import the Indian phone and use it here ...
0
votes
0answers
43 views

How is the GSM Call Flow implemented and when is the microphone opened?

Is it possible to know how is the GSM call flow implemented on Android? I will like to know concretely when its the microphone opened.
0
votes
1answer
828 views

Translation of RIL_PreferredNetworkType terminology to human speak?

In Android's source code, I see typedef enum { PREF_NET_TYPE_GSM_WCDMA = 0, /* GSM/WCDMA (WCDMA preferred) */ PREF_NET_TYPE_GSM_ONLY = 1, /* GSM only */ ...
0
votes
1answer
259 views

Nexus 5X loses GSM connection permanently while roaming

Sometimes (perhaps once or twice per week), while driving car, using mobile network ("blitzer.de" app) and roaming between different network cells (only cells but same provider), my Nexus 5X (Android ...
0
votes
1answer
456 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 ...
0
votes
1answer
4k 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".