To unblock someone on Facebook, follow these steps based on your device:

On a Computer (Desktop Website)

1. Go to Facebook.com and click the arrow-down icon in the top-right corner.
2. Select Settings & Privacy, then click Settings.
3. In the left menu, click Blocking.
4. Under the "Block Users" section, find the person you want to unblock.
5. Click Unblock next to their name.
6. Confirm by clicking Confirm or Continue.
7. Note: After unblocking, you must wait 48 hours before you can block the person again

On the Facebook Mobile App (iPhone or Android)

1. Open the Facebook app.
2. Tap the menu icon (three horizontal lines) — bottom right on iOS, top right on Android.
3. Tap Settings & Privacy, then tap Settings.
4. Scroll down to Audience & Visibility and select Blocking.
5. Find the person you want to unblock and tap Unblock next to their name.
6. Confirm by tapping Unblock again.
7. The same 48-hour wait applies before you can reblock them

On Facebook Lite or Mobile Browser

• The steps are similar: access the menu, go to Settings , then Blocking , and unblock the desired person with confirmation

Unblocking someone restores their ability to interact with you on Facebook, including sending friend requests and messages