Professional Call Blocker is an Android application developed by eletej that allows you to block and reject unwanted calls based on your preference. With this app, you can block numbers from your phone's contact list, unknown numbers, new numbers, and even numbers with specific area codes or prefixes.

The app features an enable/disable button for easy access and also allows you to block all incoming calls from your phone. You can also set up a whitelist of numbers that you never want to block.

The app also features a blacklist of numbers that you want to block, including those with specific area codes and prefixes. Additionally, the app keeps a history of all the blocked calls and sends you notifications of the blocked calls.

Overall, Professional Call Blocker is a powerful call-blocking application that provides a wide range of features for blocking and rejecting unwanted calls.