The hot topic at Mobile World Congress this year is not a new phone -apart from the Nokia 3110, they all look the same.
Nor is it a new technology like virtual reality - compared with last year, there seem to be fewer VR headsets around.
No, the biggest thing in Barcelona is something invisible that doesn't yet exist, 5G.
The hype about the potential of the next generation of mobile networks has reached new heights, with every major company exhibiting here eager to explain how it will be at the cutting edg e of the coming 5G revolution.
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