Forget everything you know about mobile phones, because the Sidekick II isn't like any mobile you have ever seen. It doesn't look like one, and it doesn't behave like one. It's big, it's got a wildly clever design feature that lets it hide a keyboard away, and it's more about messaging than about phone calls.
There's a lot the Sidekick II can't do, like share information directly with a desktop computer or play music. But it has one potentially indispensable trick -- it automatically makes backups to a rather neatly designed Web site, which you can use from anywhere.
The Sidekick II is exclusive to T-Mobile and costs up to £49.99, though it is free on some Web 'n' walk tariffs.
The Sidekick II is an unusual-looking mobile phone, even putting aside the fact that it is larger than any handset we've seen for a very long time. At first glance it actually looks more like a games console than a phone, because each of the short edges houses three controllers, while in the middle is a fairly large 66mm (2.6-inch) screen.
Things get more confusing when you encounter the Sidekick II's exceptionally likeable 'flip'. If you push gently at the top right edge of the screen it swivels round on a hinge at its top centre, to reveal a keyboard. Swivelling the screen back is slightly less elegant and wow-ish, but very easy.