Otterbox defender
Otterbox defender of course! It really keeps the same shape as the iPhone 4s and adds a ton of protection. Its screen protector hides fingerprints and smudges really well also! Other great things about it is its size is very nice, and the headphone jack opening is quite large and allows almost all third party headphones to be plugged in with no problems.
Also Me and my wife both are paratroopers in the US Army, so we can be pretty tough on our phones, and our daughter uses one too, she has no choice, to easy for her to break a phone.
;-) but we could really use a new BT headset