Sentinel cydia tweak is a call blocking extension for iOS devices.
With Sentinel you can view a history of the blocked numbers that have tried to call you, when and how many times they were blocked.
Sentinel can define Blocked Prefixes, this enables you to block cold callers that use multiple numbers that are identical apart from the last few digits.
Sentinel also enables you to block callers with an unknown number.
Sentinel will alert you with optional banner, alert and vibration notifications when a call is blocked.
Sentinel is added to home screen.