Golf Clash intermittently (it has times when it can be annoying, and I'm not talking about losing currency if I lose, so I often don't like playing), although usually on my iPad rather than iPhone.
Threes (still playing!)
Data Wing (but not played for a while, was too busy for weeks, and hard to get back into, control is tricky and I've got far enough that I'm no longer at the level I need to be)
Really Bad Chess (just reloaded it after not playing for a long time, it is a variation with random starting pieces)
Lux DLX (a Risk clone, but with loads of different maps and variations available)
Flow Free (and the other related apps, over 10,000 levels complete)