repeat sms message send

Hi all i am quite new to arduino but I was wondering how to have a message send on repeat if possible to start at a set time useing a rtc if possible and only stops when the arduino resevice a message to stop


You'll need some sort of device that can SEND an SMS/TEXT message..

Like the GPRS Shield or something..
a working/activate SIM card

and what code you use to send the TEST message out.. you can just loop over a timed period.. and send out another message.. and again....... and again.........and again...

GPRS shield 101 stuff..