I feel your pain, my right thumb feels a little cramped. My immediate reaction is to return this thing, but I want to reassure you to try it for a week. It's going to feel different than what you're use to and there will be some learning curves, but you chose the big phone for a reason. The screen resolution is definitely a plus and this battery is awesome. I'm staying strong for the next week, if I still hate it (with regular use) I'll exchange it. The struggle is real, but the benefits outweigh the cons!