My au(マイエーユー) is a vital app for au users, boasting over 10 million users and the recipient of the 2022 Good Design Award. This app allows users to promptly check their data balance, usage, billing amounts, and contract information. Users can track their data usage history, billing breakdowns, and compare past billing amounts through intuitive graphs. Additionally, users can manage their contract details, address changes, and access various au services like Ponta points, au PAY balance, and the au online shop.

The app offers a support menu for self-resolution of issues, message functions for operator consultations, and reservation scheduling. Users can stay informed with notifications, manage schedules with the calendar feature, and conveniently access important information like Ponta points and au services. My au(マイエーユー) requires an au ID for usage and is compatible with 5G/4G LTE/3G/Wifi environments.