Check this out. Apparently you can unlock your car with your cell phone. We haven't tried it yet. But you can check out this YouTube video to view the process.If you ever lock the car keys in you car and have a spare car key at home, just call someone on your cell phone that has another set. You then hold your cell phone about a foot from your car door and have the other person at your home or wherever press the unlock button, holding it near the phone on their end.Your car door will unlock, saving you time to have someone from home driving to deliver your car keys to you. Distance is no problem. You can be hundreds of miles away and if you can reach someone who has the other "remote" for your car you can unlock the doors (or the trunk!).