ADD A NUMBER TO THE BLOCK LIST: From the home screen, select the Phone app. Select the Menu icon, then select Block number. Note: To automatically block calls from likely fraudsters, get alerts on suspected spam, and manually block calls, learn more about AT&T Call Protect. Free for eligible users. When a call is blocked, it is routed directly to voicemail. The call blocking feature may not affect phone calls made or received via third-party apps installed on your device. Please contact third party app developers for assistance with such applications.
EDIT BLOCKED NUMBERS LIST: From the Blocked numbers screen, select ADD A NUMBER. Enter the desired number, then select BLOCK.
UNBLOCK A NUMBER: From the Blocked numbers list, select the Remove icon then select UNBLOCK.