Can this actually be true? Cell phone trick..someone let me know if they work

Lock Your Keys in the Car? - If your car has a remote lock/unlock device (and you have a second one, say at home - aside from the one on your keychain that’s locked inside the car) you can call someone at home on their cell phone from your cell phone, hold your phone about a foot from your car door, and have the person at home press the unlock button on the device, holding it near the mobile phone on their end. Your car will unlock. 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.