It has been nearly 18 months since Windows Phone 8 was released on October 29, 2012. In that time, Microsoft’s mobile operating system has seen three minor updates. That all changes today. Windows Phone 8.1 was has finally been announced by Microsoft. We go hands-on with Windows Phone 8.1 to give you a first look at the new operating system.

Windows Phone 8.1 builds on the NT kernel that was introduced in Window Phone 8. Users can expect to buy devices loaded with Windows Phone 8.1 later this month.

The introduction of Cortana and a notification center are by far the biggest headline changes coming to Windows Phone 8.1. Although you will find plenty of smaller fixes that all together add up to a substantial new experience. Check the video out above and let us know what you think.