I have a lot of experience in this field. I will personally test your android app or game and provide you details of error, bug or issues. As a proof you can get screenshots or recorded video.
Contact me for more info
My phone is Gigabyte GSmart Classic Pro
OS Android OS, v5.1 (Lollipop)
CPU Quad-core 1.2 GHz
Memory 16 GB, 1 GB RAM