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Aug 23, 2015 6:26 AM in response to Swoosh123by elcpu,Swoosh, in reference to your first question, I don't think that there is a way, not sure however, but I do not know how. Check this guide out and perhaps there is a clue: Block calls and block or filter messages on your iPhone, iPad, or iPod touch - Apple Support
Re: you second one, do you have a backup to either iCloud or better yet iTunes from a time prior to deleting the number? Is so restoring from it would likely bring it back.
Good luck, elcpu