The City OS Common Service (My Number Card Common Functions) app (hereinafter referred to as "this app") provides a My Number card reading function that utilizes NFC (near field communication) function, and is used in local government digital services. This is an android application that supports safe management and convenient use of personal information.By using this app, users can easily import their My Number card information into the digital services of the local government they wish to use. This function reduces errors in entering personal information and enables prompt and accurate provision of information.In addition, depending on the content of digital services provided by local governments, we will provide functions that link with the MyKey platform and Hitachi public personal authentication services.MyKey platform cooperation function:Through this app, it is possible to link local government digital services with the MyKey platform. You can link your MyKey Platform account to your local governments digital services and easily manage the sharing of your personal information and credentials. This streamlines the management of accounts for municipal digital services and improves security.Hitachi public personal authentication service collaboration function:Through this app, it is possible to link local government digital services with Hitachis public personal authentication service. Users can access public services and easily verify their identity through this app. This speeds up the formalities and application process, reducing waiting time and hassle.This app is used when it is called by the services provided by each local government when it is necessary to read the My Number card for the digital services provided by each local government.If you are specified to use this app when using the services of your local government, please download and install this app from the store (Google Play) on your smartphone device.After installing this app on your device, you do not need to operate the app. It will be automatically called from the local government service you use.When called from the local governments digital service, the screen of this application will be displayed, and you can enter your My Number Card information by following the instructions on the screen of this application and ``holding your My Number Card over your smartphone. Import it to your device.After that, you will be returned to the screen of the digital service of the municipality that called up this application.