To use the "Mobile Partner" app on your mobile device, you need to download and install the app from the respective app store (e.g., Google Play Store or Apple App Store). Once installed, you can launch the app and follow the on-screen instructions to set it up and use it on your mobile device. The app is primarily designed for managing and connecting to mobile networks, so it allows you to easily access internet services and perform various network-related tasks on your mobile device.