I work in a fairly industrial environment - good at killing phones!
I used to have a JCB phone which was great - but very basic (not in the least smart!).
Since then, I've had a series of iPhones and protected them in Otter-Boxes which are available from light weight impact protection right up to submersible cases (http://www.otterbox.asia/armor-series.aspx) you can drive over (how do I know this?) without the phone being damaged! They are a bit chunky though.
i bought a cat phone from argos on line ,after reading the q & a on the website ,only to find the only pay and go sim i could get it to work on was virgin