AT&T’s top executive called on American allies Thursday to ban the use of Huawei Technologies equipment, days after a top executive at the Chinese telecommunication giant was arrested in Canada amid a U.S. probe into whether the company violated sanctions against Iran.

While the federal government has taken several steps to curb the influence of Huawei and fellow Chinese telecom firm ZTE Inc. — including banning the sales of devices from both companies on military bases — other countries around the world still utilize equipment from both companies.