Programming to a Modem Cinterion TC65i

I have this Cinterion Modem TC65i GSM/GPRS connected to serial port COM1 (Windows XP or 7).
I use a SIM card from a local operator used for celular phones like Iphone, nokia, etc.
Bought a tiny program named php_ser.dll which works with my installation of Apache, PHP, etc.
Can send SMS messages using php language and using a delay(), can send thousands of sms with one click.
As you might know these modems can send one sms every 5 to 6 seconds!.
My question is:
Can I use arduino language to send messages to my Cinterion TC65i gsm/gprs as if I was using AT commands or commands used by the Hyperterminal of windows XP via COM port?
Has anyone tried such thing?
Any comments and ideas!
Regards
Franco :slight_smile:

SFE has some GSM shields, for example http://www.sparkfun.com/products/9607
Even I haven't program unit myself, but for starting point I'd go through all their sample code, see if it works with other models w/o much modification, except some re-mapping command set.