BARCELONA — Sliding phones — remember them? BlackBerry certainly does, giving us a glimpse of a mystery slider phone here at Mobile World Congress. Rather imaginatively, it’s nicknamed “the Slider”.

The mystery Slider phone isn’t a finished product; it was flashed by BlackBerry boss John Chen at the launch of the new 5-inch Leap, which is nearly finished and goes on sale in April.

Slider phones typically include a keyboard that slides out from under the screen. Popular in the pre-smartphone days, their days were numbered the second the iPhone came along and showed us the virtues of a touchscreen that takes up the whole face of the phone.
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