迷惑メッセージ・電話ブロック is a free Android app developed by KDDI株式会社. This utility and tools app allows users to easily block unwanted messages and calls by simply installing the app and making the necessary settings.

One of the main features of this app is its ability to protect users from dangerous phone calls. By utilizing the nuisance call database and the smartphone address book, the app can detect potentially dangerous calls such as fraud and display a warning on the screen.

In addition to blocking unwanted calls, the app also provides measures against unsolicited messages. It closely monitors potentially dangerous SMS, such as phishing scams, and can automatically sort them into the junk folder when linked with the + message feature.

Another useful feature is the app's ability to automatically reject incoming calls. Users can set the app to automatically reject nuisance calls, preventing them from answering the phone and also preventing them from calling back if they forget.

Furthermore, the app provides information about the caller's identity. When receiving an incoming call from a public facility or company, the sender's name is automatically displayed. Users can also access over 5 million pieces of information on the yellow page, even for numbers not registered in their smartphone's address book.

Please note that an au ID is required to use this service.