Both were introduced at Mobile World Congress in March and the XL stands for exactly what you think it does. At 5.7-inches, this is a pretty big Windows Phone.

The 640 XL is the spiritual successor to the Lumia 1320, but Microsoft seems to have done away with the 4-digit phone naming scheme, at least for now. But while it might be a successor, it's more than just an iteration what came before it. Design wise, from the front the XL looks like a larger Lumia 640. Understandable. From the back, though, there's a feeling of the Lumia 1520 with that slight camera hump.

The 640 XL shares most of the same internals as the Lumia 640, and as such it's not going to break the bank. The UK launch will see prices around £219 for the LTE version and that's pretty respectable for a large form factor smartphone with some of what we're getting here.

Like the camera, for example. It's a step up hardware wise from the Lumia 640, with resolution upped to 13MP and Zeiss optics included. Pair this with Lumia Camera 5 and our initial impressions are pretty good. For a cheaper phone, a camera of this quality isn't often found.

720p at 5.7-inches isn't the highest PPI around, but that's not to say the Lumia 640 XL has a bad display. Far from it. Deep blacks and bright colors make for a good viewing experience all round.