How to block a number on Android.

To allow incoming calls from a number you previously blocked, follow these steps:

1. From any home screen, tap Apps. 
2. Tap Settings. 
3. Tap Call. 
4. Tap Call reject. 
5. Tap Reject calls from. 
6. Tap the trash can. 
7. Select the number(s) you want to unblock. 
   Tap Delete.
   

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Author: Anthony Baldwin