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16

Whether or not you can use a phone on a specific carrier depends on a variety of factors, but it is generally possible to figure it out provided that you can find enough information on the device and carrier you are interested in. The main points to focus on will be the cellular standard the carrier uses, the frequency bands it uses, and the associated ...


14

Simply impossible. Mobile Network IS GSM. GPRS, EDGE, UMTS or LTE, which are different standards for providing packet-based Internet connections, are all expansion of the GSM standard and, as such, require a GSM signal.


9

Based on avirk's hint, I found a way. First press the code *#0011# GSM example: GSM900: IDLE T: 10, B: 10 Rx Pwr: -94, Rx ual: - Rx Lev: 21, Tx Lev: 0- Speech VER: AMR EFR FR VOC: AdaptiveRate TS: 0 Temp: 68 Batt: 71 LNA: 0 Service: Available It is obvious that it's using 900MHz band, from the "GSM900". UMTS WCDMA example: WCDMA: Idle Rx CH: 10612, R: ...


3

You can switch your phone to Airplane mode - this will shut down ALL radios. After this, turn on ONLY the WiFi and you'll be able to use it as a WiFi only device.


3

There are two levels of technical reason why this wouldn't work. Not all mobile phones allow the software to control the audio that gets sent over a voice call: the microphone feeds directly into the cell radio. This is the same reason that apps to record calls or play sound over calls don't work on every phone. GSM lossily compresses the sound signal ...


3

It depends on your carrier's technology. According to Wikipedia all the encryption used in GSM (A5/1, A5/2 and A5/3) have been cracked (albeit some are more difficult to decrypt than others). A5/2, the least secure of these, is no longer in any GSM-related standards (and newer phones shouldn't implement it). A5/3 has not been decrypted in 3G, but people have ...


2

Go to Settings > Applications > Manage Applications. Select Google Play Store from the list. Select Clear data. Then try using Google Play again.


2

Looking at this, GSM:900/1800/1900 Mhz,3G TD-SCDMA 2010-20250 MHZ And scrolling on down a bit on that page under the 'Data Application Features'... Data Service GPRS;EDGE;TD-SCDMA That would explain it, no UMTS/HSPA/HSPA+ mentioned in the spec of that hardware, as that would be required to have T-Mobile operating to enable 3G data. It may be ...


2

You can try dialing *#*#4636#*#* and then going to "Phone Information". That will show details about the network like cell tower ID and network type. As you can see from the below screenshot, it shows "EDGE" mode :- Also, this may only work on stock Android builds.


1

Yes, it can. GSM and later phone protocols automatically adjust the phone's transmit power according to the strength of the signal it gets from the cell tower. It's just like how, if you're talking to someone and you can't hear them very well (because they're a long way away, or in a noisy environment), you'll tend to talk louder or shout, but if you can ...


1

Okay, here's what I can gather... There should be no real loss of capability if you move to AT&T. While AT&T does not advertise LTE Band 8 capability on its S5s, Band 8 is largely used in South Korea, Japan, and Taiwan; unless you travel to those places, it shouldn't be a problem. I would, however, check AT&T's coverage map to be certain. ...


1

The following is no complete solution, but at least a work-around, avoiding a long reboot: There are apps like Quick Boot (others have things like "fast reboot" and the like in their names/descriptions). Other suggested by those names, they do not really reboot your device, but simply restart the system server (for details, please take a look at Can ...


1

Some devices would have the kernel compiled with ACM serial support (this is dependent on manufacturer/board/kernel) so that it could be used as a dial-up modem from a PC via USB cable, that is the functionality behind /dev/ttyACM n where n is a digit as allocated by the kernel. To check for that, look in /proc/config.gz which is the kernel configuration ...


1

As I said in my answer to your first question: Be warned that the device file you need to use is different for each model of phone, so you'll have to examine /dev on each device to find out which file to use. If you can't find a report from someone else who has got it working on the same phone, you'll need to use a little trial and error to find the ...


1

That depends. If you are allowed to divert incoming calls and messages to another number, you can divert them to a number that is disconnected and you will still have the data connection on your phone.


1

You are right in that it theoretically should be possible to make the switch without dropping the signal, but unfortunately we users and even CM developers can do very little to change that. The only thing the ROM does is tell the radio to switch from one mode to another, it's up to the radio's firmware to decide how to make the change. These firmwares are ...


1

Yes and no. The hardware is capable of sending/receiving GSM calls and texts but there's no way to do with via the stock software. I doubt any after market app would do the trick either, as it appears that tweaks need to be made at the OS level. There are a couple of devs working on this on XDA. There's no eta, but they should get it done in time. We can ...


1

If you get a device working on a specific carrier or not depends on the following factors: cellular standards and frequency bands artificial locks on the device and sometimes willingness of the carrier First, check what your future carrier and phone have. For carrier networks and frequencies Wikipedia is the most complete source I know: ...



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