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Unlock Your Car Door with a Hand Phone

Wednesday, September 07, 2005

Got this fwd-ed mail this morning via internal email. There was an interesting discussion on this and some claimed to have tried it and works! Here's the email;

If you lock your keys in the car and the spare keys are at home, call someone on your cell phone.

Hold your hand phone about a foot from your car door and have the other person at your home press the unlock button of your key fob (clicker), holding it near the phone on their end. Your car doors 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.


Some claimed it to be a hoax:

Comments: Comforting though it may be to imagine you can unlock your car door in an emergency by receiving a distant signal via your hand phone, it can't possibly work — not with the technology as it now stands, at any rate.

Here's why:

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 hand 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 — 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 hand 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.

Source: http://urbanlegends.about.com/library/bl_unlock_door.htm

While some tried to be funny;

I have an old car and I have to use the old fashioned key method.

So, my question is, if I lose my keys, but someone at home has a spare set, can I call them and get them to rotate the key while holding it up to the phone?? Will that work?


Anyways, give it a try and tell me how u go.
posted by Ivan Choe, 10:49 am

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