Working with AT Commands (Mobile Application)

In this article I am going to explain how you can use at commands for mobile application development. Before I am going to explain AT command I want to share some knowledge with you. AT commands are for GSM modem only so in order to execute at command you need mobile with GSM modem. Each mobile has either a Text mode or PDU mode or both. Depend upon the different mobile manufacture. So there are different at commands for different modes.

How can you execute AT Command ?
You can execute AT commands by programmatically or by HyperTerminal.
Go to Start >> Programs >> Accessories >> Communications >> HyperTerminal

And then connect your mobile using serial port and start play with AT commands.

If you want to develop a mobile application then you should go with C/C++, VB, VB.net, C#.net. My choice of language is C#.net.

.net has a class for serial port communication which you can use directly and built your application. You need the deep knowledge of threading and delegate to develop such kind of application.

Capabilities of AT commands are seamless. By using AT commands you can send SMS,Receive SMS, Call etc... In short you can handle all your mobile handset function by using your PC.

AT commands for Text Mode :
AT+CSMS Select Message Service
AT+CPMS Preferred Message Storage
AT+CMGF Message Format
AT+CSCA Service Centre Address
AT+CSMP Set Text Mode Parameters
AT+CSDH Show Text Mode Parameters
AT+CSCB Select Cell Broadcast Message Types
AT+CSAS Save Settings
AT+CRES Restore Settings
AT+CNMI New Message Indications to TE
AT+CMGL List Messages
AT+CMGR Read Message
AT+CNMA New Message Acknowledgement to ME/TA
AT+CMGS Send Message
AT+CMSS Send Message from Storage
AT+CMGW Write Message to Memory
AT+CMGD Delete Message

AT commands for PDU Mode :
AT Attention command
AT+CMGL List message
AT+CMGR Read message
AT+CMGS Send message
AT+CMSS Send from storage
AT+CMGW Write message to memory
AT+CMGD Delete message
You can download complete AT command list from the links below.

For text mode :

Download PDF
For pdu mode :
Download PDF

These two files contain the detailed information on what are the commands for Mobile Handset and what will be the output of each command. It is easy believe me !!

NOTE : all the content I wrote is related to mobile application development using AT commands. AT commands are very useful for serial port communication with attached device on serial port.