GSM is an abbreviation for "Global System for Mobile Communication"
GSM is a second Generation Cellular Standard popularly known as 2G Standard. It is standardized by ETSI(European Telecommunications Standardization Institute).
Questions tagged [gsm]
1485 questions
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votes
4 answers
Sending AT commands to SIM900 whilst pppd is active
I have a Raspberry Pi with a SIM900 GSM add-on board connected. I have managed to establish a GPRS connection with pppd by following this guide. (It's for a different GSM module but the steps are the same)
I would like to periodically send an AT…
Ollie
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votes
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Getting started with SIM card
I want to start working with cell-phones and SIM cards. I searched a lot in the internet but still I have some problem!
I want to know :
1. What is the difference between (U)SIM cards and Smart Cards?
As I know, SIM and USIM, both are a kind of…
TheGoodUser
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Where I can find the USSD commands specification?
I need to implement a simple application to send short notify messages on gsm phone display via a GSM modem.
I know that I can use the gsm USSD protocol to send messages instead of sms in order to speed up the delivery.
Where I can find a detailed…
Lorenzo Melato
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3 answers
how to change preferred network type over adb android?
How can I change the preferred network type with ADB?
Example: set Use only GSM, use only WCDMA, use only LTE or automatic.
Sidartha Carvalho
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votes
3 answers
playing WAV file over GSM modem
I want to play a WAV file over GSM modem. Here is my sample code
private final int BUFFER_SIZE = 8;
private File soundFile;
private AudioInputStream audioStream;
private AudioFormat audioFormat;
public void playSound(String filename) throws…
Shantanu Banerjee
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6
votes
1 answer
What does ^BOOT coomand means on Huawei E220?
I have connected Huawei USB UMTS modem (E220) to my Linux box, i.e. RaspberryPi.
Now I get 2 ttyUSB port available to communicate to it, where I use ttyUSB0 to establish mobile Internet connection and ttyUSB1 for other tasks, like sending and…
TomiL
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2 answers
How to send SMS by GSM modem in PDU mode?
I want to send SMSs in PDU mode. I have checked the spec for my modem, and it supports PDU mode.
I have developed a PDU encoder and decoder, but now I do not know how to send data to my modem. I tried these AT commands:
AT
AT+CMGF=0
after…
motevalizadeh
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6
votes
2 answers
Android mobile as GSM Modem to send/receive SMS on PC?
Is it possible to use an Android mobile device as a GSM modem with PC?
I am developing apps under .net to make send/reieve SMSs and so on.
Now I'd like to connect my android devices via USB to my PC and use it as a GSM modem to communicate with…
Tajamul Iqbal
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Communicating serial port on windows with php
I'm working with an application which connects to Huawei 3G Modem using COM ports in php. Here is my code:
Radhakrishna Rayidi
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2 answers
Api / services for receiving sms (text messaging) online
My current project requires us to receive text messages online. It's hard to wade through the search results as many of the are just websites with about 10 numbers for everyone to use.
I am looking for services along the lines of what is being…
KennyV
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How are duplicate sim cards detected by the provider?
why can't you use an original and a cloned sim card at the same time? How does the provider detects that both are trying to connect to the network? I have been reading about the authentication process but I am still a little confused and I need more…
jorgeAChacon
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Send an SMS message (UTF-16) with an unknown character replaced by a "replacement character" in Android
I have a problem with sending SMS messages. I created a string with characters like "\uFDE8" (it's 65000). When I convert it back, I get 65000. It looks OK.
But when I send an SMS with this string and receive the message, I have this character…
hevy
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Is it possible to read signal quality from GSM/CDMA modems while connected?
I know I can communicate with GSM/CDMA modems using AT commands. However, as far as I know this doesn't work when connected - is there a way to read status information (signal strength, GSM/HSDPA mode etc) while connected?
I am not sure if…
ondra
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Switching between gps and network provider according to the availability
public void onCreate() {
locationListener = new GeoUpdateHandler();
locationManager = (LocationManager) getSystemService(Context.LOCATION_SERVICE);
try {
gps_enabled = locationManager.isProviderEnabled(LocationManager.GPS_PROVIDER);
…
Lenin
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4 answers
Retrieve GSM signal strength in Android
I'm a newbie to Android.
How do I get the GSM signal Strength in terms of percentage (1 - 100%)?
Ashraf
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