What kind of ads are you seeing? Intrusive ads are generally a result of malicious apps that you have installed, knowingly or unknowingly. "Free" games tend to be some of the worst offenders of this kind.
There are a few things you can do to identify these apps so you can delete them:
☆ Use Samsung’s Nice Catch app
If you’re experiencing unexpected or unexplained ads, pop-ups, wake-ups, etc., Samsung’s Nice Catch app can help identify the offending app so that you can delete it.
Turn on the various categories in Nice Catch.
When the undesirable behavior happens again, check Nice Catch to see which app triggered it.
If your phone is locked to a carrier, be aware that some of their bundled apps can cause problems. For example, Metro Play (on Metro-locked devices) has recently been reported to replace users’ lock screens with its own ad-filled lock screen. If you’re experiencing strange behavior, make sure to review any apps tied to your carrier and see if the undesirable behavior can be turned off. Better yet, disable or uninstall the app altogether if possible.
You can also potentially reduce the number of ads you see by using an ad-blocking DNS. To set this up, go to Settings > Connections > More Connection Settings > Private DNS and set your DNS to dns.adguard-dns.com
