If you're wondering how to stop ads from popping up on my phone lock screen then you must follow the steps that are given below:-
1. The initial step is to launch Settings on your phone.
2. Now search for Apps & Notifications and then tap on the Configure Notifications section.
3. Then scroll downwards to the Show Notifications section and select the option that says Notifications on lock screen.
4. Now finally tap on Don't show notifications.