Tell Microsoft how Cortana can make your life easier, enter to win a Lumia 635
To enter the sweepstakes you’ll have to visit the Nokia US Facebook page at the source link below (official rules are available there, too). You get extra shots to win if you invite your Facebook friends to join the contest - which, by the way, ends on August 13. There will be 5 winners, each receiving a Nokia Lumia 635, plus a mysterious "Cortana lunch box."
Already available to buy in the US, the Lumia 635 is a cheap Windows Phone 8.1 handset, but it’s one of the firsts to come with Cortana pre-installed.