I'm using the Ultra now to play. Haven't noticed any particular issues. I know there was a brief problem when the first came out but Kabam fixed that quickly. I can't think of a single time the game froze or kicked out since upgrading. Still have the occasional input issues but that doesn't seem to be related to the phone. It's a big, heavier phone, so you may need to get used to the slightly different hand placements (I came off the S10+).