I want to make sure that you get all of your calls. I want to make sure I understand what you are experiencing. When is this happening? Do they appear just when you are getting calls? When did this start happening?
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It's possible you have downloaded an app that causes those ads. I recently had that issue after downloading a certain app (don't remember the name of it), and when I uninstalled the app the ads went away. I refuse to use any app that makes me go through a bunch of ads just to get to my home screen.