The largest cellphone companies in the U.S., and the number of devices on their networks:
Verizon Wireless, 106.3 million
AT&T Inc., 98.6 million
Sprint Nextel Corp., 52.1 million
T-Mobile USA, 33.6 million
MetroPCS Communications Inc., 9.1 million
U.S. Cellular Corp., 6.0 million
Leap Wireless International Inc., 5.7 million
