The 5G wireless technology now being introduced by phone companies promises to bring a world of innovations to mobile service — from connected appliances to self-driving cars — just as its predecessors made it possible for phones to become handheld computers. The first big upgrade to the world’s mobile-phone networks in a decade also promises a new round of global technology competition. The race to build 5G overlaps with arguments over its security that have pitted the U.S. and some of its al
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