Click... Busted. (Thanks for the laugh though. Nice troll... them fish are a-bitin' today.)
Car alarm & keyless entry remotes operate at radio frequencies of many MHz. There's no way a phone's microphone can pick that up. Even if the electronics in your phone somehow acted like an antenna to pick up that signal, and even if it somehow made it as far as the phone company's central office or cellular site, it'd get filtered out. Phone transmission equipment only allows frequencies from about 300 to 3400 Hz (not MHz) to pass. That's why a phone call doesn't exactly sound "hi-fi". That audio frequency range is enough for a conversation, but passing any more than that would be a waste of the phone company's bandwidth; i.e. it'd cost the phone company more to do it so they don't. Anything outside of that frequency range won't make it beyond the point where it first gets digitized.
The only way I can see this working would be if your car's remote operates on humanly-audible sound tones, in which case it's probably manufactured by Fisher Price. :^)
17:12:25 01/26/05
