Why should it break? These things have been out for a while now. They should be bulletproof by now. As in MIL-SPEC 810G. You can certainly buy phones that are.[1] They're less bulky than iPhones in cases.
I don't know what kind of case you're putting your iPhone into, but those phones are far bulkier than even the bulkiest OtterBoxes that I've seen. Plus, I have a suspicion that my iPhone even without a case would probably survive being stepped on by a boot and dropped into water.
