http://www.youtube.com/watch?v=SRBhijF5HiA Before I had to send back the Vodafone Nokia Lumia 635 (which was kindly loaned to me). I had to put Windows Phone 8.1 back onto the handset (as I had to remove the Windows 10 Technical preview). Note: The price of the Nokia Lumia 635 from Vodafone is now £75 or free on a £14 a month contract. http://www.vodafone.co.uk This video documents the process I used. Here is the link to the Recovery Software: http://www.microsoft.com/en-gb/mobile/support/faq/?action=singleTopic&topic=FA142987 In Part 1 I look at the Start Menu, All Apps Menu, Notifications, Phone Dialler, Text Messages and the Windows Store. https://youtu.be/h6lNyo1vQ5M In Part 2 I look at the Camera app, The Lock-screen and Cortana. https://youtu.be/eAAYgsg8sso Review: http://www.crowdedbrain.co.uk/softwarefeatures/windows-10-technical-preview-phone-impressions.html