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Block persistent callers from contacting you
Calls significantly drain your battery meter, even if you don't pick up incoming calls. If you get the same persistent person calling, you can now block them from reaching you.
To do this, head back to Settings and scroll down to Phone. Scroll down further to Blocked and select the contacts you wish to automatically refuse access. While this feature blocks the call coming through, it doesn't prevent the caller from leaving you a voicemail.