In the run-up to this September’s big tech releases, the chief executive of Huawei was spotted on a plane, using a rather odd device. It was a folding phone, much like the many others on the market — which you can read reviews of in our pages — but it didn’t just have a central fold. Rather, it had another fold, expanding even further out horizontally. Folded up, it looked like a fairly normal, but thick, smartphone. Unfolded, it looked like a full iPad.