Block and Unblock numbers
BLOCK:
1. From the Dial tab in the Phone app, select the  Menu icon in the Search field then select Settings.
Note: To use Wi-FI calling from your tablet, you must update your device to the most current software version and set up NumberSync.
2.Select Block numbers.
• The following options are available:
• ADD PHONE NUMBER: Enter the desired number then select the Add icon.
• CONTACTS: Select Contacts then navigate to and select the desired contact.
• BLOCK UNKNOWN NUMBERS: Select the Block unknown callers switch.
• RECENT CALL: Select Recents then select the desired number.
Call Protect
• 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.