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.

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will a gsm international phone roam onto all carrier networks in USA including verizon?

Im about to buy a Galaxy s21 5G phone on amazon. it says its international version, ie no cdma support i use the t mobile network (which is GSM i believe) my question is , will I see worse performance ...
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Making a phone into a signal generator

I'm a test engineer who would like to use an Android phone's CDMA or GSM antenna as an RF signal generator. Whenever I try to search the web for any info on this, I only get info about how to use the ...
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Voice Changer in Realtime GSM Phone Call

hello I was wondering whether it would be possible to apply voice changer on GSM Phone call in realtime? If possible, then I'm thinking of using a voice changer mechanism to secure the voice data ...
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Is it possible to intercept phone calls and override the voice data?

I am researching whether it is possible to intercept a mobile phone calls and modify the voice data to be transmitted ? Can we intercept and retrieve voice data for modification before transmission?
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No tetwork (sim card doesn't allow connection to this )

Help please. I repaired my phone's imei with xposed and now i have no network connection. When i choose a network it says: sim card doesn't allow connection to this. I put the sim in other phones and ...
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Will a Xiaomi Redmi Note 9 (international version) work reliably in the United States (comparable to a domestic phone)?

I'm buying a new phone, upgrading from an LG Q7+, and so far the best phone I've seen is the Xiaomi Redmi Note 9. The only con to this is that the Note 9 is only available in International version, ...
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How to call and SMS from Android smartphone with SIM via internet remotely?

I want to use my phone number when traveling abroad and there is no possibility to setup roaming, etc. So the idea is: I have Android smartphone. I have my SIM inserted in the phone. The phone works ...
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Will a CDMA carrier's LTE work on a GSM-only phone?

More specifically, I'd like to know if a Sprint-based carrier (Tello) will work on a Xiaomi Redmi Note 8 (M1908C3JG).
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Is any way to lock Android KitKat to a certain frequency/band?

Normally we can lock our mobile to either LTE, WCDMA, or GSM thorough Network Mode option from setting. But I would like to lock specifically 900MHz and/or 1800MHz band, which they are included as GSM ...
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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 ...
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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 ...
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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 ...
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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.
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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 ...
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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 ...
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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 ...
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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 */ ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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. ...
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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'...
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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.
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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 ...
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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 ...
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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!
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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 ...
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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 ...
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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?
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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.
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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 ...
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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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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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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 (/...
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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".
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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?
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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 ...
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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 ...
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Is it possible to share GSM or 3G or 2G connection?

As I know that Android phones can share WiFi by using tethering. So, may I know if it is possible to even share my phone GSM/3G/2G connection? (of course without applying another SIM card for another ...
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1 vote
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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-...
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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 ...
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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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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
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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 ...
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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 ...
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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 ...
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