U.S. intelligence agencies have issued a stern warning to Americans: Do not buy smartphones made by Chinese tech companies Huawei or ZTE. There is a risk of letting any company “beholden to foreign governments” inside the country’s telecommunications infrastructure, he said. Huawei is a global leader in networking equipment, and the government has previously blocked it from selling technology to some federal agencies. Huawei has not made strides in the U.S. market in large part because of government concerns that the Chinese government can use its smartphones and other products for intelligence gathering.