Share your experience!
It might be from one of your older apps, perhaps an antivirus or something that has phone access.
Wow, that's new: Spam on lock screen. Some people would never have learned to program...
If the ads is a notification then long press that notification will show an "info" button that will allow you to see what's the app and disable notifications.
If not, just think about that maybe you have not installed nothing new, but an app that is already on your phone maybe was updated. Make a list of suspected apps and try to uninstall one by one.
That's why I don't install too much apps. The way it got money is with spam and some apps have a very invasive way to show that spam.
Greetings!.
@Danixu Nice piece of advice. Hopefully the app can be tracked by it's notification.
Keep us updated. @MrsTea By any chance, do you think you could have enabled demo mode?