Last year, a chip breakthrough put Huawei on top of the Chinese smartphone market. Now it is rolling out its newest phone, the Mate 70 series. Huawei Technologies Co Ltd, Smartphones, Computer Chips, Semiconductor Manufacturing International Corporation, Computers and the Internet, Taiwan Semiconductor Manufacturing Company Ltd, China Last year, a chip breakthrough put Huawei on top of the Chinese smartphone market. Now it is rolling out its newest phone, the Mate 70 series. NYT > Business