On the cusp of the availability of Windows 10 Mobile for Lumia devices, comes the User Guide for Windows 10 Mobile for Lumia owners.
If you’re interested in knowing if your Lumia will be upgradable to Windows 10 Mobile, check the following site:
https://www.microsoft.com/en-us/mobile/support/product/lumia640/faq/?action=singleTopic&topic=FA144485
The main site for Windows 10 Mobile is available here:
https://www.microsoft.com/en-us/mobile/windows10/
The user guide is download able here:
- DOWNLOAD: User Guide for Lumia with Windows 10 Mobile
http://download-support.webapps.microsoft.com/ncss/PUBLIC/en_US/smartwebpdf/GUID-8D2842BA-8EA5-49A6-A66E-36C87437D092/Lumia_with_Windows_10_UG_en_US.pdf
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