BlockIT is a lightweight application designed to block unwanted phone calls, providing a wide range of features including different blocking modes.

Features:
- Add phone numbers to the blacklist
- Block unknown and private numbers
- Block numbers by their prefix
- Every blocked call is stored in history along with a timestamp
- Easy to use, lightweight, simplistic user interface
- Notification when a call has been blocked (can be disabled)
- Ad free version

Blocking modes:
- Block numbers from blacklist
- Block unknown and private numbers
- Block numbers by prefix
- Block unsaved numbers (numbers that are not in contacts)
- Block all phone calls

Details:
1) Numbers that are added to blacklist can be tagged with an optional name to identify them easier, if not provided, the default name will be "Blocked number #x".
2) Blocking modes can be combined (e.g you can block numbers from blacklist and also block unknown/private numbers).
3) Blocking numbers by prefix has never been easier - just add the prefix to blacklist then select "Block numbers by their prefix" from Settings.