Yeah you can delete all those by going to your file apk / downloads or there are pretty much apks on the store whitch allow you to manage your files my favorite is es files explorer just write es on the store and you'll find it
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Go on your message apk and go to the informations and then click on disable notifications it should work, otherway there are some apps that allow you to block numbers
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Hmm actually it's working for me but try an alternative: try to share it in the notepad or some other apps and the copy it :d
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