Best Blacklist is a phone answering software that allows you to Automatically rejects unwanted callers. and Your phone will be always busy for unwelcome calls!
When you have an incoming call BlackList application instantly detects incoming number and uses unique algorithm (reverted binary tree) to analyse it and determine if the service has to reject it or not. Regardless of how many numbers/contacts it has to analyse it rejects the call if needed in some microseconds, before your phone starts ringing and disturbs you.
Best Blacklist for S60 3rd edition