1. Open an App Store (such as Google Play or App Store) on your phone.
2. Enter "Microsoft Store" in the search box (it may be "Microsoft Store" or similar keywords on iOS).
3. The application information of Microsoft App Store will be displayed in the search results.
4. Click the Install/Download button and wait for the application to download and install.
5. After downloading, click the application icon to open the Microsoft App Store.
Please note that the name and interface of the Microsoft App Store may be different on different mobile phone operating systems. If there is no pre-installed app store on your mobile phone or you can't find the Microsoft App Store, please check whether your mobile phone meets the compatibility requirements of the Microsoft App Store, or try searching for "Microsoft Store" in your mobile browser to access the web version of the Microsoft App Store.
If the above steps can't successfully download the mobile Microsoft App Store, you can also try to find the download link of the app in Microsoft official website and download and install it according to the link.