Unlock car with cell phone

Maranatha Bruce. I understood that it was for people who have locked their keys in their car. What would that make any difference anyway if the keys were in the car or at home. Either way you couldn't push the unlock button near the car which is the only possible way to activate the system. Again I stand by my comment that this CANNOT work because key fobs transmit an RF signal on a certain preprogrammed frequency with a sub-audible tone encoded (different tones for different functions i.e. Unlock, Lock, trunk release, sound horn, etc). The problem is that the receiver in the car which works like an am-fm receiver tuned to the same frequency as the key fob has to receive a RF transmitted signal with the sub-audible tone. The receiving phone cannot reproduce the RF transmitted frequency so therefore it won't activate the receiver in the car. It only produces AF (audio frequency) tones or signals whether digital or analog.

It's not that I don't want to use it Bruce. It would be a handy function if possible. It's that I say it cannot work. Try it and you'll see it won't work.

If you would like to check out my credentials as a General class FCC licensed radio technician send me a pm and I'll provide you my call sign and where to look it up. I would put it here but I don't want everybody in the world knowing who I am and the link shows exactly where I live down to the degree.

Tracy