wanstonic

Hi All, I need your help. I wanna make a complete system into my car controlling some things like switch on/off parking heater, alarm - if need - lights etc. Cellphone can also ring me up in a case of trouble... I imagine that just making a call, and send some DTMF or something like that, and my car will do, what I want. How can I do this, with any kind of cellphone? Thanx.