Okay I need you guys to help me with this. It worked for me and nobody believes me (or attempted to try it) so I want you to so I can see if I'm just tripping or something. What you need:
2 fully charged cell phones
1 car with 2 remotes
a second person to help
You and the person go about a block away from each other, one taking the car. The person without the car calls the person with the car. Person with car gets out of car and shuts the door. Person without the car uses remote and aims into mouthpiece of phone. Person with car holds their cell phone near where the brain to the remote is under hood, dash, where ever. See if the door locks or unlocks.
Does this work for you?
This worked for me. This is good for when I lock my key in and I call the other person who has the spare. Saves them a trip to where I am.