Cingular Wireless was a mobile phone company from United States. Cingular is now owned by AT&T. AT&T Mobility LLC (usually called AT&T) is fully owned by AT&T and provides wireless service to more than 120 million users in the United States, Puerto Rico and the U.S. Virgin Islands. AT&T Mobility is the second largest mobile phone company in the United States behind Verizon Wireless, which has more than 130 million users.