The second-largest wireless voice and data carrier in the US by subscribers (after Verizon), AT&T Mobility serves about 110 million mobile users over a nationwide network that spans all major metropolitan areas. A subsidiary of AT&T, it accounts for more than half of its parent's business. AT&T Mobility provides a full range of wireless voice, messaging, and data services to consumer and enterprise customers. The unit's services for businesses, government agencies, and educational institutions include e-mail, wireless Internet access, and private wireless networking. The company provides international network coverage for its subscribers in more than 200 countries through partnerships with other carriers.