Mobile FeliCa Client is an application that comes standard with Osaifu-Keitai compatible smartphones. It is an essential application for using Osaifu-Keitai. It is also an essential app when using mobile FeliCa compatible services for wearable terminals on Wear OS devices. *Osaifu-Keitai compatible smartphone models that do not require reinstallation or updating (update) of this application may be displayed as follows in the Play Store, but it will affect the use of this application and Osaifu-Keitai function. No. It says: "This app is no longer compatible with your device. Please contact the developer for more information."