AT+GSM

1. Answer an Incoming call – ATA

To answer an Incoming call via modem, issue the “ATA” command in the minicom.

RING
ATA
OK

When there is an incoming call, you can see a ‘RING’ message in the minicom. You can press “ATA” to answer the incoming call.

2. Dialing out and hanging up a voice call – ATD – ATH

You can also dial out a voice call from the modem using ATD command.

ATD 99769XXXXX;
OK

Now the phone will dial out to the number 99769XXXXX.

To hangup the call, use ATH command.

3. Getting the Manufacture/IMEI/IMSI information

Extended AT commands are used to provide information about the manufacturer, International Mobile Equipment Identity, International Mobile Subscriber Identity etc…

AT+CGMI
Nokia

OK
AT+CGSN
xxxxxxxxxxxxxxx

OK
AT+CIMI
xxxxxxxxxxxxxxx

OK

4. Getting Signal quality and battery charge status

You can also get the signal quality and the battery charge status using AT extended commands.

AT+CSQ
+CSQ: 29,99

OK
AT+CBC
+CBC: 1,96

OK

The output format +CSQ: 29,99 represents ,

The output format +CBC: 1,96 represents ,

5. Sending SMS using AT commands

You can also send SMS via AT commands.

AT+CMGF=1
OK
AT+CMGS= »99xxxxxxxx »
> This is a test message
>
OK

The command AT+CMGF=1 sets the “Message format” to “text mode”. The command AT+CMGS, send the SMS to the specified number. < ctrl +z > is used to terminate the message input.