well it wouldn't be picking up sound anyways. it would be radio frequency and cell phones are nowhere near the radio frequency of a keyless entry remote.
plus...why would you hold the phone right near the door? the radio reciever isn't in the door
what kinda idiot wrote that anyways?
I am wondering tho...if you had a two way radio... that was broadcasting at the same frequency as the remote when the button is pressed..im not SURE if the two way would amplify the frequency enough to do anything, but THAT might be worth a try...a cell phone is just dumb