Windows Phone 8.1
Windows Phone 8.1 is a mobile operating system developed by Microsoft and released in April 2014. It introduced several new features, including a customizable Start screen with live tiles, a notification center for quick access to alerts, and improved multitasking capabilities.
The update also brought a new voice assistant called Cortana, which allows users to perform tasks using voice commands. Additionally, Windows Phone 8.1 supports a wider range of apps and games, enhancing the overall user experience and making it more competitive with other mobile platforms like iOS and Android.