So you enjoy playing games on your smartphone? You can improve your performance with a decent controller like the Gamevice Controller for iPhone. It has dual analog joysticks and all the buttons you need to play your games. The device comes with a 400 mAh battery. You can charge your iPhone while you play.
Gamevice is compatible with a wide variety of iOS games. It is compatible with iPhone 6s and iPhone 6s Plus. Costs under $100.