Samsung Galaxy S2. I've been always using it only for calling, texting, checking the weather in the morning, and automatic sync with my watch after a run (and perhaps with some light Internet browsing), so combined with a phone case, the phone has seen very little outside world, which limited any potential damage. I did have to replace the battery twice, though.

Now that my Canon Powershot died, though, I'm still considering whether to upgrade to a phone with good optics or get a new camera. They are roughly the same price.