Microsoft does not list its cross-platform apps for Xbox, Solitaire Collection, Money, Sports, News, Weather, Sway, Delve, Office Lens, GroupMe, or Bing on the Phone Companion. Clicking on one will lead the user to a series of steps with a description of the app or bundle, spot for emailing a link to the app on the mobile device's store, and button for marking that the app has been downloaded onto a mobile device. There is a Get Started button below each.

If the user selects the Android or the iOS screen, he or she will see a list of apps available for that mobile operating system, all of which support Microsoft account sign-ins: Cortana, OneDrive, Groove, OneNote, Skype, 'Office', and Outlook. It is not clear why OneNote, Outlook, Sway, Delve, and Office Lens are not included in the Office category. Clicking on an icon in the list provides a description of what the app does. On the Windows 10 Mobile screen, users are shown a list of apps that are already built-into their phone's system: Cortana, Photos, Groove, Movies & TV, OneNote, Skype, 'Office' ( Word, Excel, and PowerPoint only in this listing), and Outlook. Under the listing for Windows phones, there is a link to view available devices. Once the user has chosen, a second screen presents the user with information on some of the available apps. The first screen allows users to choose a type of mobile device that they own. It is now discontinued and replaced by the Phone Link app in the October 2018 Update.

In order to use the Phone Companion, users had to sign in with a Microsoft Account, which would sync installation progress across devices. It provided a partial list of Microsoft apps that are available on Android, and Windows 10 Mobile. Phone Companion was an app advertising and file transfer utility included with Windows 10 and available for Windows 10 Mobile.

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