FIFA 16 Mobile (often referred to as "FIFA 16 Android Exclusive" or the "Hybrid Edition") is still considered by many players to be one of the best football experiences on mobile, despite being discontinued by EA Sports. Because it is no longer supported officially, installing it via ZIP and OBB files is the only way to play.
If you are seeing an "unavailable server" or "cannot connect to EA servers" message, it is not a problem with your device or internet connection. The official online servers for FIFA 16 were permanently shut down by Electronic Arts on . Once the servers go offline, the base version of the game is no longer able to authenticate online, leaving players stuck at the loading screen or an error message. fix server fifa 16 zip file download android exclusive