+1 for mikewsmiths suggestion
otterbox and griffin cases do work well
although not waterproof my dad dropped his iphone in an otterbox defender in a bucket of water by accident – took it out and it still worked. Still going now as mrs Tr phone.
My iphones been dropped in its griffin countless times and its still unmarked !
I also have the c3-01 as a works phone and its a robust little bugger. No matter how i treat it i cannot break it and the battery lasts for ever , cameras impressive too No gps tracking though.
Its pish for internet browsing compared to the iphone , but thats not what its for !
Mines for listening to the radio on the way too and from work without worryign about it getting wet in the rain…… and for when im away on business for work calls…..