Due to the capability issue, some devices may experience minor performance issue with gameplay, technical support etc. Please refer to following minimum requirement by device.
Minimum OS - 11.0
iPhone SE or newer, iPad Air
Minimum OS - 5.0 (Lollipop)
Galaxy S7 or newer, etc.
If you fulfill requirement and still experience issue with performance, please feel free to send us support ticket about your concern and we will try to resolve it as soon as possible.