Hi, I have an old prepaid LG-420 GSM phone I would like to use to send SMS messages from my Uno. I would like to use this phone instead of buying a GPRS shield, which is above my budget.
I am curious if anyone's had any luck interfacing an Arduino with a cell-phone? One idea may be to hack the keypad of the the phone and generate DTMF tones with the Uno to emulate keypresses, though I kind of doubt the phone uses DTMF internally. I could also wire each button of the phone to a D-O pin, but the Uno doesn't have enough I/O to do that.
The best thing I think is to control the phone via its USB port. Does anyone have any experience/suggestions on how to do this?