Real-time incoming number analysis. 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. Just busy. Because of real-time number analysis and almost instant call reject all unwanted callers won't even know that they are blacklisted, they will just hear busy tone all the time. Scheduler. Scheduler makes BlackList your completely automated personal secretary. The service can reject everyone except family member at night, accept only co-workers at business hours on working days, etc. Real interaction with built-in contacts. When you set up your black lists you can add here contacts from your contact book (not just import phone numbers!) and even more you can insert here groups of contacts. Just create in your built-in contacts application some groups like Family, Spammers, Co-workers, etc and add these groups to as many lists as you need without adding tons of contacts to every list. Service based application. BlackList is professionally made application and consists from configuration application that you can start like any other application and service module (always-in-memory process). When you have configured the settings you can activate the service and close the configuration application. The service will do all job using really small amount of memory, system resources and absolutely transparent to user. Just configure and turn it on one time and you can forget about it and forget about all unwanted callers as well.