Of the three, only the Lumia 635 will be available in the United States. At a more intimate evening event, the Finnish handset maker offered PCMag and other media outlets a closer look at the Lumia 630, Lumia 635, and Lumia 930. Nokia introduced three new Lumia smartphones running Windows Phone 8.1 on the main stage of Microsoft's Build developer conference this week. How to Set Up Two-Factor Authentication.How to Record the Screen on Your Windows PC or Mac.How to Convert YouTube Videos to MP3 Files.How to Save Money on Your Cell Phone Bill.How to Free Up Space on Your iPhone or iPad.How to Block Robotexts and Spam Messages.