Most users block numbers directly through their device settings (iPhone or Android). AT&T respects these settings, so you must unblock the number through your phone first.
Scroll down and select (on iOS 18+, this may be under the "Apps" section). Tap Blocked Contacts . att unblock number
Tap the (three vertical dots) in the top-right corner and select Settings . Tap Block numbers or Blocked numbers . Most users block numbers directly through their device
If you blocked the number through your AT&T online account or via the myAT&T app (often used for parental controls or specific line blocking): Tap Blocked Contacts
How to Unblock a Number on AT&T: A Complete Guide Accidentally blocking a friend or needing to restore communication with a business is common. Whether you are using a smartphone, the AT&T ActiveArmor app, or a traditional landline, here is how to quickly on the AT&T network. 1. Unblocking on Mobile Devices (iPhone & Android)
Landline users often use or hardware-specific features like Smart Call Blocker . Block or Unblock Calls - AT&T