my favorite phone i've used from gaming so far is Samsung s3. It has 2gb ram, 1280×720 display, Quad-core 1.4 GHz Cortex-A9 and Mali-400MP4 so smooth for gaming...
I used an iPhone, and it works just fine for all games. There's probably something better than it though. That being said, I don't really game on my phone too much, so it's not a major concern. But for the few games, I do play on my phone, it works just fine. No lagging at all, and fast load times. It works just fine.
