AT+CMGS returns ERROR

Question

I am using SIM900 GSM module connect to my AVR Microcontroller. I tested it with FT232 to see transmitting data. First Micro sends AT it will response OK

AT          


        

Answer 1

You aren't passing all the parameters to the command.

The command format is:

AT+CMGS=

Where:

 = ASCII character 13
 = ASCII character 26

You have passed only the number and without the <CR> you won't see the > note for the message.

Example:

AT+CMGS="+9893XXXXXX"
> This is the message.→

The response is:

+CMGS:
OK

Where is the message reference.