AT&T Mobility serves 142 million wireless subscribers in the US, making it the second-largest wireless voice and data carrier in the country by subscribers (after Verizon). The domestic wireless operation of AT&T Inc., it accounts for more than 40% of its parent's revenue. 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 offers international network coverage for its subscribers in more than 200 countries through partnerships with other carriers.