Appear pixels in screen in the Android device

Hello, last week i started to learn programming Android games, but i have an issue…
In the editor mode the game screen is beautiful and clear, but in my phone the screen is not so beautiful and appears pixels. In the first picture, you can see the screen from the editor, in the second picture you can see the screen from the android device.

There could be several issues:

  1. OpenGL version issue: Edit->Graphics Emulation->Generic OpenGL ES2.0 and change Other Settings->Configuration->Graphics Level->OpenGL ES 2.0
  2. Turn off MipMaps in texture settings.