I heard on a local radio station that if you are locked out of your car you can get someone miles away to open the door with their telephone if they have recorded the signal into their phone, just in case you had lost your key to the door. I hope you can savvy that and would explain how this can be done.
Yet another myth started by a chain letter that soon becomes "a bloke in the pub told me", which is of course the most realible source of information in the world. (not)