OnePlus Android 8.x Guide

These Settings must be properly configured to keep Mobile Tracker Free working.

Info: A password may be required to access the application settings. If you have not changed, the default password is *1234*. More information about the application password here.

1) Settings  => Battery => Battery optimization => « Wi-Fi » => Don't optimize => Done

2) Settings  => Battery => Battery Saver => Turn OFF

3)  Settings  => System => Recent app management => Normal clear

4)  Settings  => Apps & notifications => See all xx apps => « Wi-Fi » => Data usage => Backgroud Data & Unrestriced data usage => Turn ON