A company has created an app for the iPhone which lets you unlock your car and start it without using a keyfob.
Viper Smartstart is a free download from the Apple App Store but you
need to have a SmartStart system installed in your car too. Acording to
Kevin Duffy, president of Directed Electronics which makes the kit, if
the iPhone and the car has signal, then you can find your car in a
parking lot too.
A remote start means you can start the vehicle by remote control,
defrost the windows and pre-warm the cabin. You can also use it to turn
the AC on too.
While the download is free, the Viper SmartStart, which will sell through Best Buy stores, costs $499.