Re heating up - my iPhone does get quite hot, but generally after about half hour of talking or games, or any other constant use.

Something else to note with iPhones, and this is really my only complaint, is that the battery runs down SO fast! I charge mine every night, because if I don't it'll run out the next day. If you're playing games or making calls, it'll run out in a day. If you're not using it, it'll run down in about a day and a half.

Apart from that, I don't know how I lived before my iPhone