Hi i am dealing with making a system that you can put it inside your car and when you ask it for it's position, it'll reply to you with the location info. So if someone stoles your car, you will be able to go where it is your car with the police . Or you can put it in your wife's car and check if she tells the truth about where she is ! Or you can see where are your company's trucks, etc..
I think the easier and the cheapest way is to use an old 6600 or newer and a Bluetooth GPS module. The whole thing is to make a .sis program that when receiving a specific SMS message like "where r u?" it will reply (via SMS) the location info to that number.
Any other ideas about this system will be welcomed, also if someone can help about the program that takes the location info and sends it to another cell-phone, it will be very helpful!