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given AT&T's infamous coverage area, this might not be a good idea.

Blackberry has this build in. It can also wipe your device if the battery gets too low.

Better idea: add an RFID reader internally, and carry an RFID tag on your keychain. When it can't read the tag for X minutes, then wipe.

If you leave your phone on the other side of the house a lot, just leave your keys with it.

Combined with a good backup policy (you can setup your iPhone to backup each sync), this would be workable.

>Idea: a self-destruct mode where if your phone can't call home to check for remote wipe and kick an internal watchdog, it will prompt for local self-destruct override. Failing that, automatic wipe.

https://secure.wikimedia.org/wikipedia/en/wiki/Dead_man%27s_...

bummer: sleeping through the alert after your local tower goes offline for a few hours.

In alarm technology, I've heard it termed a "heartbeat". No heartbeat --> panic.