Phong Thủy Số Điện Thoại is an Android app developed by Huynh Anh Tuan that allows users to check the feng shui of their phone number. With this app, users can input their phone number and the program will provide a reading on whether the number is lucky or unlucky based on feng shui principles.

The app is straightforward and easy to use, with a simple interface that allows users to input their phone number and receive an instant reading. It also provides a brief explanation of feng shui principles and how they relate to phone numbers. However, it should be noted that the app is only available in Vietnamese.