[stcredzero]

I think this is a great idea. I would add one feature: send a 2nd text message when you're within 1 mile. (Or whatever distance you choose.) My girlfriend wants me to notify her before I actually get to her apartment. Having my smartphone do this for me automatically would be awesome! (This way I don't need to use my phone while I'm driving.)

[ryanpetrich]

A text message can't be sent without confirmation from the user on iOS.

[stcredzero]

Then a message should be sent to a server that forwards the SMS text.