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.

24 questions with no upvoted or accepted answers
Filter by
Sorted by
Tagged with
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
426 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
0answers
41 views

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 ...
2
votes
0answers
2k 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
690 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
494 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
323 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
98 views

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, ...
1
vote
0answers
26 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
151 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
344 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
619 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
87 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
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
254 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
49 views

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).
0
votes
0answers
171 views

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 ...
0
votes
0answers
45 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
309 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
537 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
0answers
911 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
1k 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
251 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 ...