End of life for Windows Phone 8.1
Microsoft has announced the end of life for Windows Phone 8.1, as of 11th July 2017. As result, there will no longer be any security updates provided. The IST recommend that devices still using Windows Phone 8.1 should not be used for storing or processing University data, effective immediately.
Some handsets can be updated to Windows 10 mobile, which is supported. You can find out if your specific model is supported at https://www.microsoft.com/en-gb/windows/windows-10-mobile-upgrade.
For units using the IST's mobile device Security On A Page, available at https://sharepoint.nexus.ox.ac.uk/sites/itservices/security/Public/SOAP%20Mobile%20devices.docx, please note that this explicitly means that Windows Phone 8.1 no longer counts as receiving software updates from the manufacturer.
For further details please see https://support.microsoft.com/en-us/help/4001737/products-reaching-end-of-support-for-2017