Call Blocker is one of the most effective apps to prevent unwanted calls. Help you block the phone you don't want to answer, and bring you a quiet environment. == Advantages == Lightweight and easy to use == Features == ► PREVENT UNNEEDED CALLS - Multiple Blocking modes at your choice ► BLACKLIST - Blacklist: You can add unwanted numbers to blacklist. ► WHITELIST - Whitelist: Add important phone numbers to your whitelist so they can always reach you. ►DETECT AND STOP ONE-RING PHONE SCAM Prevent possible phone scams. ►Additional features Three options to deal with prevented calls Notifications after blocking In order to avoid being killed by the system and can not be used, please add Call Blocker to the battery's Background activity manager in the system's battery management interface. Thank you for your support!