Microsoft has announced Windows Phone 8.1, its first major update to the Windows Phone mobile operating system, which introduces a virtual personal assistant named Cortana, several cool design tweaks, and a host of new features. If you’re wondering when it will arrive on your phone, or which phones about to go on sale will have the OS pre-installed, we’ve got all the information you need right here.

Microsoft says it’s coming soon

During the Build 2014 keynote, following a lengthy introduction to the software, Microsoft’s Joe Belfiore gave an approximate release timeframe for the update. How approximate? Simply that it will be out in the coming months. Not very precise, but then it’s not entirely down to Microsoft. The official line on new phones is that we’ll be seeing the first new releases during April or early the month after.

Networks start to announce their plans

Windows Phone 8.1 Start Screens
Sprint is the first to confirm its intention to distribute Windows Phone 8.1 soon. According to the network’s communications manager, the update will be coming to the HTC 8XT and the Samsung Ativ S Neo this summer.