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They cpuld be embedded in your downloaded apps @Lynn2558
Put the phone in Safe Mode which will turn off all the downloaded apps and leaves the stock ones alone which can then help you determine if its a rogue app.
To remove adverts from internet pages their are content blockers that work with the Samsung Internet App and are available from the PlayStore.
Current Phone ~Samsung Note 20 Ultra 5G SM-N9860_256Gb SnapDragon 865+ Samsung One Ui 3.1/ Android 11.
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