How to set the Auto-Reject option on Samsung Galaxy S2?
To manage auto reject/accept mode:
1. Open the Samsung Galaxy S2 application and touch Menu key > Call settings > Call rejection.
2. Touch Auto reject mode to set the auto reject feature on for All numbers or Auto reject numbers
(auto rejects calls from numbers in the Auto reject list).
3. Touch Auto reject list.
4. Touch to manually add numbers to the reject list. You can also select numbers from your Samsung Galaxy S2 logs or
contacts by touching.
5. Mark Unknown to automatically reject calls from unknown numbers.