Why to control a cell phone with DTMF where you can control it by a simple serial protocol...
I know that new phones have USB and not serial, but still I heard it's easy enough to do it..
you can create calls, sent SMS and so on??? I really think it would be more practical...
Still, every try is for good, and I wish you best of luck!!!
Hope I'm able to help you with anything that comes up!!!
Best Regards, Lefteris