Arduino code for interfacing atmega168 and gsm modem

Hi.
Please help me get arduino code for interfacing atmega168 and gsm modem.
I'm working on a simulation project using proteus and would like to load the code and see whether it's responding.
Regards.

Hi @3TAJIM,

You need to give much more information. What modules are you using? Where are links to information about them?? What are you trying to accomplish?