You can go into the "Block" screen to unblock calls and edit Blocked Call settings.
To get into the Blocked Calls screen: open the left side menu>Block
This takes you to the Blocked Calls screen.
Under the "Blocked" tab you can see the numbers blocked. The "History" tab shows you a call history of only the blocked numbers.
Tap a name on the list and press "Unblock" to unblock this number and remove this name from the blocked list.
How to Block numbers from Recent Calls and Texts:
Press the + sign. Two buttons will appear. Choose between "Recent Calls" or "Recent Text Messages".
"Recent Calls" shows a call log of all calls from the time that you installed Sync.ME. "Recent Text Messages" is a list of all the messages from the time you installed Sync.ME.
This opens a list of recent calls (or text messages). Tap the contact in order to block him/her.
The contact will then appear in the "Blocked" list.
—————
To block a number immediately after a call:
A system notification will appear (at the top of the phone) after a call which will give you the option to unblock the number.