Here's something we didn't expect to see at Mobile World Congress, a Windows Phone running the Windows 10 Technical Preview from Alcatel OneTouch. The phone is the Pixi 3, one of its range of low cost devices that can be had in a variety of screen sizes and running either Android, Firefox OS or Windows Phone. Only this version of the Windows Phone has the Technical Preview on it.
There's no sneaky look at a future build to be had here, though, as it looks like this Pixi 3 is actually running an older build of the Technical Preview than the one Microsoft pushed out publicly. It's 100% a development prototype, too, as it's filled with custom apps for interacting with different parts of the internal hardware.
The Pixi 3 was announced back at CES and is available in different sizes, with identical hardware regardless of the platform. There's nothing we can really learn about the device from this one, but it's still pretty cool (read: nerdy cool) to see something like this slip out at a big event such as MWC. It also shows that Alcatel is at least experimenting with Windows 10 already, which has to be a good sign for the future.