To temporarily block a number for 30 days?You can download app "call protect" on app store.
No thanks.
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Description
AT&T Call Protect, available for iPhone 6 and above, lets you manage your incoming calls with more control over nuisance calls.
AT&T Call Protect uses the power of the AT&T network to automatically block fraud calls and warn about suspected spam calls in HD Voice coverage areas. In addition, temporary call blocking is available for blocking unwanted calls for 30 days at a time. It is available to AT&T consumer and business (except Government) postpaid wireless customers that are eligible for and set up with AT&T HD Voice. Smartphones sold by other carriers may not be eligible."