Right now I am obsessed with a game called The Battle Cats on IOS. I used to play clash of clans but its kinda ded.
Animal Crossing Pocket Camp, I mean if you don't like the animal cross series you'd hate it but if you do, it's a good time waster.
I'm not sure they have it for IOS, but I have a NDS Emulator and am currently playing through Pokemon Platinum. It's pretty great.
yo they have pubg on the phone in china and it runs better than on my PC. I dont know if you can get it in the US tho.