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System Requirements for OneNote and Office Mobile for Android Phones - Mobile - Office.com
Here’s what you need to install OneNote and Office Mobile on your Android phones. OneNote for Android Component Requirement Operating system Android 4.0 or later version Hardware
Install Office on your Android phone - support - Office.com
If you have an Office 365 Home Premium subscription, you can install Office Mobile on your Android phone.
Office Mobile for Android phones - support - Office.com
Why do I need an Office 365 subscription account to sign in? If you have Office files on SkyDrive, SkyDrive Pro, or your organization’s SharePoint team sites, you need an Office
Install Office on your iPhone - support - Office.com
If you have an Office 365 Home Premium subscription, you can install Office Mobile on your iPhone.
Troubleshoot Office Mobile for iPhone app errors
Provides information to fix app errors you may get with Microsoft Office Mobile for iPhone.