• Jun 1, 2007
NOTE: After reading some of the excellent comments on this post, we decided to test this again from 30 miles away... and it didn't work. We're going to retest at a different location but similar distance to see what gave us the positive test. Stay tuned.


About a month ago my brother sent me an email explaining that if a friend or family member has the second key fob for your car, you can call them up on your cell phone, ask them to hold the key fob up to the phone, press the unlock button, and your car door will unlock. In theory, the sound waves from the key fob, which are unintelligible to the human ear, will be transmitted via the cell phone, and the doors will unlock. Well, we've seen enough spam emails before that were full of it, but we decided to see for ourselves if this works.

When we tested this theory, we were stunned to find out that it actually works. I was so excited that I pulled out the wife and daughter outside to shoot a quick video on the front lawn. Before getting this on camera, we tested it five times, and it worked every time but one. There was a lot of traffic during the one failed test, so our best guess is that the noise from the passing cars negated the sound from the key fob signal.

Mad props to the wife for getting eaten alive by bugs and keeping the camera still at the same time (for the most part). Hit the jump to check it out, it's pretty damn cool. Test this out with a friend or spouse, too, and let us know if it worked for you.





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    • 1 Second Ago
  • 145 Comments
      • 7 Years Ago
      I never heard of this before and when i read this post today for the 1st time ever i thought it was the coolest thing.

      I decided to try this and it worked calling from the basement. Then with all the excitement i decided to post this in one of my own car forums. A while later one of my members busted my bubble by posting a link from snopes.com. "Urban Legend" Blah blah blah. I decided to take a ride 3 miles down the road and test again. Nope,it didnt work.

      Pooh!
      holsteinharvey
      • 7 Years Ago
      I tried this on my Honda Cr-V and it didn't work. I was about 60 miles away from home and my husband tried to unlock the car using an extra (properly working) FOB we had and nothing happened. I ended up going to the local dealership and having a key made from the VIN # to unlock the door. Maybe it works if you're closer to home.
      joe
      • 7 Years Ago
      I tried this on my chevy truck, I got nothing, except my cell phone carrier converted the RF freq. to text, therefore I am now charged for texting my own truck! LOL
      sally
      • 7 Years Ago
      Hey this only works in your own driveway because the 2nd key fob can transmit that far. Doesn't work thru the cell phone even 1/2 mile away...
        sally
        • 7 Years Ago
        @sally
        Naw, I tried it because I didn't believe it. Try it yourself. It will work if your car is close enough to the 2nd fob's signal, like out in the driveway, but not if you get too far away. Signal does not transmit through any kind of phone as it is not an audio signal.
        Sam Satan
        • 7 Years Ago
        @sally
        Are you using Cincular/AT&T? Are your fob batteries fresh? Do you just try anything because you read it on the internet?
      • 7 Years Ago
      it's B.S. in capital letters. i got an email about this months ago so we did a little experiment in our company parking lot with an e46 bmw 330ci, a lexus rx330, and a mercury milan. we tried this "trick" using a sprint phones, nextels, cingulars (now at&t), verizons, and t-mobiles, and shuffled them all around to make sure it's was b.s. before we gave up. we stood far enough away that the remotes did not work on their own. we then called the various phones and tried the remotes via the instructions and guess what....it's B.S. it does not work. what annoys me is all this b*llsh*t being dumped on the internet, and picked up by these blogs then posted on aol and the like as legit. the editor(s) should be ashamed of themselves for continuing to pass on urban myths..... rather than actual useful things that do actually work. it goes to say don't believe anything you see on the internet unless it comes from a credible site that actually tries these "tricks" before they post them as true. unfortunately aol doesn't count as credible anymore and nor does autoblog, imho.
      • 7 Years Ago
      I got this about two years ago in an e-mail. My family and I didn't believe so we had to try it for ourselves. It totally works! On my mom's Chrysler and my Ford Mustang. My phone did not have Bluetooth, it was and Alltell and we tried it on my Nextel (not on beep-beep). We were about the same distance as the poeple in the video.
      • 7 Years Ago
      Hard to argue with the video but Snopes.com still says "False"...an Urban Legend...keyfobs transmit via RF signals - not "audio" tones...never tried it myself, however...
        michael
        • 7 Years Ago
        actually i just tried it wit my 2002grand cherokee and guess what, not an urban legend its freaky it works
          michael
          • 7 Years Ago
          @michael
          mine worked with my razor phone not sure if the make of the cell your using makes a difference
        • 7 Years Ago
        Last time I checked they are both waveforms. As long as the reciever and transmiter for the phones can pick up the signal in the freq. the fob is using....
        Albert Thurman
        • 7 Years Ago
        I've done it many times and it works. It did not work from the side of the car, but when I put the phone close to windsheild where the signal receiver is located (at the front of the dash board near the windshield wipers on the Toyota SUV), it worked fine. It will lock and unlock the doors. Other vehicles might have the signal receiver in other locations so the phone might have to be closer to where that receiver is to get the signal.
        • 7 Years Ago
        I tried it with two different makes of car...a Honda, and a Saturn....NEITHER one works. Its a bunch of bull.
      • 7 Years Ago
      I see that you have a Ford vehicle so this makes me want to try it with my Focus. I am a little surprised that this would work though just because it seems like sound signals wouldn't work well for a key fob. Wonder if there's another factor at play here. Maybe the cell boosts your RF frequency just like that guys head a few posts down.
      • 7 Years Ago
      HAHhaahahahahha, I never believed in that one, until now...
      Sam Satan
      • 7 Years Ago
      Did you use a Verizon phone? They trigger the security system self-destruct module which was installed in your car by virtue of DOT regulation Ref.C197436.7. write your Congressman to demand action by DOT to review this regulation!
      • 7 Years Ago
      Check this out...

      http://www.autoblog.com/2007/06/01/video-keyless-entry-remote-not-working-use-your-head-silly/

      Your cellphone obviously seems to be boosting the RF of your fob and not really "transmitting" any sound signals.
      • 7 Years Ago
      Also, i forgot to add. You can extend the range of your keyfob by holding it up to your throat. That really does work
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