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Using modem through AT commands

AT is abbreviation for ATTENTION. AT commands are used for controlling the modem directly. These commands are derived from Hayes Modems commands which were in use few decades earlier. You can use AT command to do specific task which your Modem’s dashboard does not allow you to do. For example sending USSD command to check prepaid balance.
1
Dashboard just act as interface between you and the modem. You can use AT command to do some common tasks:— 
1. Obtain info about device and SIM.
2. SMS/MMS services.
3. Data Services.
4. Voice Services.
To send AT command you need to have the manual of the modem, and remote shell client like PuTTY.
Here is nice and detailed instruction to send AT commands to your modem.
http://3g-modem.wetpaint.com/page/common+AT-commands
You’ll need to find AT commands specific to your modem. Many modems have some common ETSI compliant commands but they may have their own proprietary commands. Search on Google for them. 
For this you are on your own.
Here are some ETSI compliant modem AT commands
http://www.activexperts.com/mobile-messaging-component/at/etsi/
http://www.engineersgarage.com/tutorials/at-commands?page=4
Be careful while using AT commands. Sending random unknown commands could also lock your SIM/Modem rendering it useless.
Further Reading.:—
Comment if you need help.

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