Method 1:
Call up the background task page of the mobile phone to see if there is any application corresponding to the pop-up advertisement. If there are money-making applications such as cleaning, WIFI and walking, I suggest you uninstall the corresponding software and use observation.
Method 2:
Download third-party advertising blocking software, such as "AdGuard" application. You can open this link: /welcome.htm to download advertising blocking software. Open the software after downloading-click the bottom to accept-select Quick Setup (1 min)-create a local VPN and select OK-click the "X" symbol in the upper left corner of the jump page-the opened page will display protection.