I feel like as phones get more and more pixels, dead ones will become more of an issue and manufacturers may come up with some sort of policy like TVs requiring a certain number of dead pixels for a replacement.
EDIT: Just downloaded a pixel test app for mine, and as hard as I could look, I don't think I found any. There were a few times I thought i did, but then I realized it was just a spec of dust and brushed it away. Is there a trick to finding them? LOL Either way, I'm super happy with the display aside from the graininess at low brightness levels.