[Sonic67]

http://www.wikihow.com/Make-a-Smart-...a-Mobile-Phone

You can track your car if it gets stolen and listen in too. Interesting idea.

[Kieron]

Nice idea, but I think datatag (the transponder kit) would be a better bet for thirty five quid.

http://cgi.ebay.co.uk/OFFICIAL-DATAT...QQcmdZViewItem

Very interesting though, If I had a luxury car I would certainly do this as well as the datatag kit. Every little helps!