Can we expect Surface phone on MWC 2018? If no, then when can we expect?
A big problem for MS is people not knowing they had a mobile OS in the first place, and people brand shopping. Most people do not talk about OS', but iPhone or Samsung. At least where I live. And there is iPhone chargers, and Samsung Chargers. Micro USB, what's that?
If MS want to be successful they have to have OEM's on board. When MS themselves became the largest Windows Phone and mobile manufacturer, they took a huge chunk of a small market. Samsung, HTC, LG and others saw no point in competing with MS in a small market segment. However, If Samsung sold as many Windows devices as MS did, things might have turned out differently. Snap Chat still would have had a huge impact though.
In the PC market things are different. They can sell lots of Surface devices, and still be outsold by their OEM's by a magnitude. If MS are indeed working on pocketable PC's with cellular functionality, they should be working with the larger OEM's as well. When they release their Surface concept, the OEM's should be tight on their *** with their own devices. And MS should make sure the OEM's sells more devices than themselves, at least until the device form factor gets momentum and developers gets onboard with app development for mobile form factors.
I believe they will release a new device, but MWC 2018? Not so sure about that one.