Advanced Call Filter can 1.Block unwanted calls2.Block unknown calls3.Block a range of number such as 1800XXX4.Block calls with message reply5.Answer and quick hang up option.6.Block text for android 1.6 or above user.Any issue or suggestion please do not hesitate to ask me.Tags: advanced call blocker, call blocker, call filter, sms blocker, sms filter,filter,mobile firewall, call manager, sms manager, call guardian,black baller, black list