We have found a good resolution solution for phones with resolution problem. 

"Easy DPI Changer" [Root] is an app in the Google Play Store.
https://play.google.com/store/apps/details?id=com.chornerman.easydpichanger or  https://play.google.com/store/apps/details?id=com.samsung.android.gametuner.thin  for Samsung users **Note, you need to root your phone to use it, you can google download root tool to help you, for example  https://play.google.com/store/apps/details?id=eu.chainfire.supersu **
Download this app to convert your phone's low resolution to high resolution.

You can convert to the resolution you want.  Our game screen is optimized for iPhone.

DPI: 320

750 x 1334 (iPhone 6), 640 x 1136 (iPhone 5) See other devices.

This way, you can play the game well with no more resolution issue!