I have read on the Internet of people who have tried it and it worked along with those who say it is impossible because of the difference in frequencies. I had to ask my service specialist who works on remote key less entry systems, along with all locking systems, window motors, electronics, car computers, etc. He is one of the most knowledgeable people I know when it comes to working on cars. He said it is definitely possible.
After confirmation from him, I had to try the theory. I know I looked crazy holding my cell phone near the car and waiting in anticipation for the result I wanted. I held it near the door with no results. I told my wife to hit the unlock button again while holding my phone near the windshield, closer to the actual sensor that communicates with the remote key less entry. I was nearly 1 mile away with obstruction and hills in the way and was very surprised when the door unlocked. I have seen it work! It may have been a fluke of some kind because it makes no sense to me, but it did work on a 2001 Pontiac Grand Am. Although it did unlock the door 2 times, it would not lock the car, pop the truck, or sound the panic system.
Do you any of you think this story is real? And if so, have you successfully used your cell phone to open a car door?