OPPO/Realme 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.

• Settings => Dual SIM & Cellular => App Using Wi-Fi and Mobile Data => « Wi-Fi » => Service => Select 'Wi-Fi and Mobile data'
• Settings => Security => Permissions => Apps => « Wi-Fi » => Allow All
• Settings => Battery => Power Saving => Turn OFF
• Settings => Battery => Smart Power Saver => Turn OFF
• Settings => App Management => « Wi-Fi » => Permissions => Allow All
• Settings => App Management => « Wi-Fi » => Power Saver => Allow Background Running => Turn ON
• Settings => App Management => « Wi-Fi » => Allow Auto Startup => Turn ON
• Settings => App Management => « Wi-Fi » => Allow Notch Area Display => Turn ON
• Settings => Additional Settings => Device & Privacy => Location Information => Apps That Use GPS in the Background => « Wi-Fi » => Turn ON

Be careful, with ColorOS 5 :

• During an audio recording, the notification bar will blink red to warn you that a recording is in progress.
• If accessibility and device administrator is enabled, the bar will blink orange.
• For each screenshot there will be a popup displayed to ask if you want to take a screenshot.

It is not possible to hide this, it is a security of the ColosOS system.