i found this today and was wondering if anybody had tried it

 

Have you locked your keys in the car? Does you car have remote keys?

 

 

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).

 

Editor's Note: *It works fine! We tried it out and it unlocked our car over a cell phone!"*

Nick gets his keys and mobile phone... :D Back in 15 mins

I actually wondered about this but it will depend on the frequency transmitted by your key fob and if the frequency response of the mobilea are suffiicient.

This may work if your key fob uses ultrasonic, can't see how it would work with radio frequency and definitely won't work with infared.

This may work if your key fob uses ultrasonic, can't see how it would work with radio frequency and definitely won't work with infared.

I agree.

 

(But then I can't explain why holding the fob against your head seems to double the range either!)

i tried it with a tape recorder. if i lose/forget my car keys, i just rewind the tape and press play, and the ultrasonic sound recorded on the tape will unlock the car door.

lol, surely the only signal that the recieving phone would transmit would be audio to the speaker!

 

why would a mobile phone transmit an RF signal sent from another?!?!?

:rofl: Somebody please confirm this is *****x? :rofl:

Yep total *****x :D Tried it this morning much to the amusment of my neighbours :rofl:

:rofl: :rofl: :rofl: what utter smeghiezer

You lot need shooting to put you all out of your misery :rofl:

pmsl :rofl:

 

mate could your sig get any darker and smaller? :D hehe

pmsl :rofl:

 

mate could your sig get any darker and smaller? :D hehe

 

You listen to me my friend, it took me all this time to work out how to put the bloody thing up there and it was the first pic i came across so leave me alone bully.

 

 

Hey I just thought, if you could send me my campaign poster I could use that.

OK, I tried this earlier and it did actually work with mine!!!

OK, I tried this earlier and it did actually work with mine!!!

 

well it would with yours mate ;)

 

 

ps. Many Happy Returns! :duffer:

I agree.

 

(But then I can't explain why holding the fob against your head seems to double the range either!)

 

Because your body is acting as an antenna.

OK, I tried this earlier and it did actually work with mine!!!

 

How far away were you ? Is it possible that the keyfob was in range ? Is your keyfob ultrasonic or RF ?

i was round the other side of my sisters mahoosive house, but i tried it with out the mobile phone first and could not open the car (which was in the garage)

then tried with the mobile and it did actually work.

i was round the other side of my sisters mahoosive house, but i tried it with out the mobile phone first and could not open the car (which was in the garage)

then tried with the mobile and it did actually work.

So the phone was acting as an aerial for the keyfob.

So the phone was acting as an aerial for the keyfob.

 

Doubt it.

 

I'm even dubious about how this would work with an ultrasonic keyfob. Voice down a mobile phone is hugely compressed and concentrates on just the frequencies required, higher or lower than normal speech are unlikely to be transmitted to the other end at all. Standard modem frequencies would probably go, but ultrasonic .... I dunno ....

iirc the passband on a normal telephone system is 0.3-to 3.4KHz (and i can't see why a mobile would be any different) as this is where the majority of "information" is in human speech. Therefore I would think it highly unlikely that a ultrasonic key fob would work as a human would have to be able to "hear it" in order for it to be transmitted over the phone.