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Como se elimina la publicidad que aparece en todas las aplicaciones y ocupa toda la pantalla?
How to remove the advertising that appears in all applications and occupies the entire screen?
-GT
Hi @Daniela23, that must be very annoying! 
I have translated your question to English as this is an International forum, please post any replies in English and will be easier for me and other users to assist you.
Ads are usually coming from a downloaded application, or if you have an open tab in the web browser that you use that is just an ad.
To check if these ads are from a downloaded application, try restarting your device in safe mode, as all downloaded applications are temporarily disabled in this mode so we can easily tell if one of them is the cause of this.
Let me know how it goes!