[wave100]

I'd have gone the overly complicated route - throw a relay in there and tie it to something that detects whether or not your phone is connected to your WiFi network. Automatically disable it when you're already home!

[maddyboo]

Until you forget your phone at home and proceed to lock yourself out of your apartment with no way to call for help!

[wave100]

Ha, that sounds exactly like something I'd do.