Once you hit that final confirm button, the magic happens immediately. The person is unblocked. However, keep the following in mind:
The layout of the Facebook mobile app is slightly different from the desktop version. Here is how to do it on your phone: unblock facebook user
Show aggregated, anonymized data to help user decide: Once you hit that final confirm button, the
Unblocking a Facebook user is a straightforward process that can be completed in seconds, whether you are using a smartphone or a computer. While blocking is often a quick reaction to a conflict or a need for privacy, unblocking allows you to restore visibility and communication with that individual. unblock facebook user
Once unblocked, a strict 48-hour cooldown period begins before the user can block that same person again.