Settings > App Management > Installed > “WiFi Service” > Permissions > Allow All.

Settings > Battery > Energy Saver > “WiFi Service” > Abnormal Apps Optimization > Power OFF

Settings > Battery > Energy Saver > “WiFi Service” > Background Freeze > Power OFF.

Click on “Add apps that run in background” and select “WiFi Service”.

Open “Settings” > “Security Settings”.

Phone Master > Me > Settings > Protected app > Enable “WiFi Service”.

Phone Master > Toolbox > Auto-start management > Enable “WiFi Service”.

Make sure “WiFi Service” is protected.

Open Application “XOS family” > X Manager > Auto-Start Manager > Enable “WiFi Service”.

Open IManager application and enable “WiFi Service”.

Open autostart application and enable “WiFi Service”.Go to Settings > Additional Settings > Privacy > Disable “Verify apps”.

Open Application “Security” > Go to Permission > AutoStart > Enable “WiFi Service”.Settings > Apps & notifications > Apps > WiFi Service > Battery > Launch > Manage automatically > Power OFF.Settings > Apps & notifications > Apps > WiFi Service > Battery > Power-intensive prompt > Power OFF.Phone Manager > Power saving > Protected apps.Settings > Apps > WiFi Service > Battery > Allow background activity > Turn ON.Settings >> Apps > WiFi Service > Mobile data > Allow background data usage & Allow app while Data saver > Turn ON.Settings > Device maintenance > Battery > Unmonitored apps > Add apps > WiFi Service > DONE.Go to Settings > Lockscreen & Security > App Permission Monitor > Disable “WiFi Service”.

SAMSUNG GALAXY 8.0 DEVICES (like Galaxy s9, s9+, s8, s8+)

Settings > Apps > WiFi Service > Mobile data > Allow background data usage & Allow app while Data saver > Turn ON.

Settings > Device maintenance > Battery > (bottom) Click on Unmonitored apps > Add apps > Select “WiFi Service”.

Refer detailed steps at Settings-android10ĥ.2 Make Application Trusted 5.2.1 SAMSUNG (Android >= 7).

To do special settings in Android 10, you need to connect the phone with the Windows Desktop and run the Permission Tool.

Click on it.ĥ.1.2 Hide App Icon with Permission Tool (Android >= 10) 5.1 Android 7 and above 5.1.1 Lock Application in Oppo/Vivo/Redmi/Mi/Samsung

Viber for android 2.2.2