To unblock someone:
- Click
in the top right of any Facebook page
- Click Privacy Shortcuts
- Click How do I stop someone from bothering me?
- Click View All Blocked Users.
- Click Unblock next to the name of the person you want to unblock.
Ultimate way to unblock someone on Facebook on Mobile
Note: If you were blocked by another person from viewing their pictures or accessing their profile, you cannot unblock yourself except he or she unblocks you.
Best way is to call them and ask them to unblock you. If you are honest with them, they will unblock you. Cheers!