Originally Posted by Corkscrew
Have you locked your keys in the car? Does your car have
remote keyless entry? This may come in handy someday. Good reason to own a
cell phone: If you lock your keys in the car and the spare keys are at
home, call someone at home on their cell phone from your cell phone. Hold
your cell phone about a foot from your car door and have the person at
your home press the unlock button, holding it near the mobile phone on
their end. Your car will unlock. Saves someone from having to drive your
keys to you. Distance is no object. You could 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).
THIS DOES NOT WORK...it's a myth that's been circulating on the web for some time now....
Comforting though it may be to imagine you can unlock your car door in an emergency by receiving a distant signal via your cell phone, it can't possibly work â€” not with the technology as it now stands, at any rate.
Your remote car key operates by sending a weak, encrypted radio signal to a receiver inside the automobile, which in turn activates the door locks.
Since the system works on radio waves, not sound, the only conceivable way a signal from your spare remote could be picked up by one cell phone and relayed to your car's onboard receiver by another would be if both phones were capable of sending and receiving at exactly the same frequency as the remote itself â€” which they can't be, given that all remote entry devices operate at frequencies between 300 and 500 MHz, while all mobile phones, by law, operate at 800 MHz and higher.
It's apples vs. oranges, in other words. Your cell phone can no more transmit the type of signal needed to unlock a car door than your remote key is capable of dialing up your Aunt Mary ... though no one can predict what miracles the future may bring.