I dont think its worth it if it goes thru your homeowners.
Cause for one they could raise your premium, 2nd mostly everyone got a $500 deductible so that wouldnt work. And even if you lower it or do a no deductible policy you'll be paying much more money every year.
It would be cool to get a seperate policy just for the iphone that would cover it for lets say $30-50 a year and thats not connected to your car or home policy.
Or finally get AT&T to offer insurance on this phone like they do with many other cellphones.