As one of the world’s biggest sellers of smartphones and the back-end equipment that makes cellular networks run, Huawei Technologies has become one of the major symbols of China’s global technology ambitions. But as it continues its rise, its business with some countries has fallen under growing scrutiny from investigators in the United States. American officials are widening their investigation into whether Huawei broke American trade controls on Cuba, Iran, Sudan and Syria, according to an administrative subpoena sent to Huawei and reviewed by The New York Times. Read more
