On April 10, 2015. Microsoft released the Windows Phone 8.1 build 15116, which was the first build number for Microsoft, in awards can reach 100 thousand for phones, on May 15, 2015. Microsoft reaches Windows Phone 8.1 can be launched for Microsoft Lumia and Microsoft Mobiles, on June 29, 2015. Security Update for Windows Phone 8.1 has been a free update for Microsoft, a year later for ended support, on August 18, 2015. Microsoft has news notification the Windows Phone 8.1 has been ended for support until July 2017, after release in 2014, they have no support for Windows Phone 8.1 and security update, Microsoft reaches the upgrade update for Windows Phone 8.1 to Windows 10 Mobile, was free upgraded until July 12, 2017, after the end of support, on July 19, 2017. Microsoft has the free upgraded Windows 10 Mobile for Windows Phone 8.1 from the Microsoft website after the service has been ended for Windows Phone 8.1.