[narayan]

does it work that way !!! u could pull a fast one at some one doing that...

i have had another bizarre experience of my friend who used his ALTO remote keys and when he pressed open, another car in the parking lot also unlocked !!!

[amitpunjani]

hi,

Wow!!, really never ever heard of this before.

Amit

[Knight Rider]

We had tried what @mjothi has mentioned, It works guys!!

[Rotorhead]

wow.gotto try this out sometime..Does this work for all cars ?

[sammyboy]

The first thing I did, when i heard about this concept ( a long time ago), was to try if it works.
It didnt.

[omishra]

I tried unlocking the car two floors down using this trick.

First part keeping duplicate key near mobile is OK, but now I need to make sure where to keep the near-car mobile exactly?

[mjothi]

Originally Posted by omishra

I tried unlocking the car two floors down using this trick.

First part keeping duplicate key near mobile is OK, but now I need to make sure where to keep the near-car mobile exactly?

Keep positioning the near-car mobile between the windshield and hood.

[Sam Kapasi]

You know, I always assumed it was a hoax. Now that you say you have tried it yourself and it saved you from a sticky situation, I believe it does work.
I must try it sometime.

[DirtyHarry]

I have read about this quite a number of times. Unfortunately, it has not worked for me. I've even tried putting the phone on speaker mode.

[tsk1979]

A phone speaker produces audio frequencies.
If your central locking system is unlocked by audio frequencies, then I suggest you get a new security system, lest your car unlocks every time somebody farts

[Sam Kapasi]

Originally Posted by tsk1979

A phone speaker produces audio frequencies.
If your central locking system is unlocked by audio frequencies, then I suggest you get a new security system, lest your car unlocks every time somebody farts

A phone speaker only finally produces audible frequencies so one can have a conversation. But GSM phone data carrier signals are not Audio.

That's the reason mobile phones produce RF interference. I don't think he is saying his locking system unlocks with audio frequencies but that the signal from the other remote is being transmitted along with the carrier frequencies. I don't know if it is possible, but it is not impossible.

GSM data is carried on non audible frequencies. Otherwise your mobile phone would ring everytime I fart.

[Jeep]

This happened about 4 years back in our M800 (1996 model). At that time, it didn't have central locking.

I went to visit a garden with my younger brother and mom and when we came back, my bro realised that he left the key at the ignition.
The solution was simple, asked the driver of the Omni who had parked beside our car for his keys. That key as well was old (a bit worn out) and it was so easy to open our car lock with that.

[prabuddhadg]

This is a 2 wheeler incident. A friend was riding his Kinetic Honda automatic scooter, and when he reached his destination, he noticed that his key had fallen off and the scooter's engine could not be shut off. He rode to a mechanic and got him to remove some wires that shut the engine down. Had to get a new key made before he could ride on again.

[amitoj]

Originally Posted by Sam Kapasi

A phone speaker only finally produces audible frequencies so YOU can have a conversation. But GSM phone data carrier signals are not Audio.

That's the reason mobile phones produce RF interference.

But what the phone at the other end (where the duplicate key is) is getting is also an audio signal only. Unless the RF signal being transmitted by the key is uncoded and lies in the frequency range that the GSM carrier is using, i dont see how this can work. The code being used by the security system can not be replicated by the transmitter of a cellphone.
And if it IS working, then you do really need to get a better security system.

[Sam Kapasi]

Originally Posted by amitoj

But what the phone at the other end (where the duplicate key is) is getting is also an audio signal only.

Sir, an audio signal is merely the final user interface, so that the user can comprehend the data being transferred. Audio signals cannot be relayed on-air. Any phone (even cordless), on any end does not send or recieve audio signals.

Similarly, readable text is merely the final interface of an SMS. The alphabet is not relayed on-air. There are GSM high frequency signals that carry data.

I am not a telecom engineer so I cannot elaborate as much as I'd like to.

I am not agreeing with the poster, I do not know if it is possible. I am merely saying that it is not impossible that the unlocking signal frequency somehow piggy backs on the carrier signal.