iPhone 4
my first smartphone, bought it when it just came out cuz all my other phones were breaking all the time. Never had any problems with it, dropped it on concrete countless times, never breaks - awesome.
4S here, but yep, I've dropped it numerous times in its flimsy rubber "case" (more or less just rubber bumpers on the sides).
Works great! Picked it up a week after they released and have had no issues with it whatsoever. Stills holds its charge just fine too!
I went through two different Android phones in a month- they would both constantly lock up, even after resetting them to factory defaults.
Got tired of taking the case off and pulling the battery out to unlock my phone upwards of 10 times a day, so I went and picked up the iPhone.
I'm not an Apple fanboy here, but goddamnit they work as they should and feel nice and sturdy.