Hi Dear all !
I have a BIG problem . I want to send and recive sms from my AVR memory with GSM modem and without any PC . I searched in web but people referd me to this atmel application note"AVR232:Interfacing GSM modem"(doc8016) . But in this article there is a PC , and AVR is only an Interface . I want to send it with only AVR .Please help me .
Regards 
first you need to decide on a GSM module.
Most have AT command sets, then you can just send a message from your microcontroller by sending a command over the serial port.
For example my GM47 module waits for a command like
AT+CMGS=“+447747008670”
returns a
>
it then sends the next string it recieves as an SMS to the number above
Tnx a lot
can you help me more & step by step ?
do you know sim 300 ? I want to by it .