Microsoft's most affordable 4G handset, the Lumia 635, is currently available to buy off-contract from just $84.99, with a 4.5-inch display, 5MP rear camera, 1.2GHz Snapdragon 400 and 8GB storage.
A week of Windows 10, holograms and Exploding Kittens on Mars
Office 2016 launching this year, touch apps coming soon
Microsoft reveals the next version of Windows 10
Introducing Windows 10 for phones
Hands on with HoloLens
Download: Windows 10 build 9926