Originally Posted by frankie_boy
I think the idea is that the radio signal can be transmitted down a phone line and come out the other end unaffected....
Absolutely not ! You can't send a RF frequency down a 'phone to come out at the other end as RF, what you end up with is audio.
Assuming that the cars lock is triggered by RF this cannot possibly work. On the other hand even if the car lock works on an audio signal, which they don't, the limited bandwidth on the 'phone system would probably prevent it from working anyway.
Can't test this on mine as I don't have keyless locks, who's going outside to test this and put it to bed ?