I don't know what you are using it for. I have an Iphone 4 about 2.5 years old. I bought the otterbox defender for it and it has fallen out of my pocket from approx 3 stories (32 foot ladder fully extended) onto cement and when I take it out of the case it looks BRAND new, not a scratch on it. Now there is a "Lifeproof" case for it which is waterproof (never tested it though). Because it survived that fall once, I now leave my phone in the van when I go up the line.
That was 4 months after I got the phone. I remember looking at it from the line and my heart was crushed. When I got down and found it unscathed, I instantly thought GIFT from upper beings and "lesson learned"