SunCom formed an agreement with Global Signal Acquisitions in June 2005 to lease tower space that they subsequently sold.

On September 17, 2007, T-Mobile USA Inc. announced it would acquire SunCom for approximately $1.6 billion in cash and $800 million in assumed debt.

Beginning in 2001, SunCom merged with AT&T Wireless that served states in the Great Lakes area including Wisconsin, Illinois, and Michigan.

In 2003, the company began overlaying GSM, along with its associated GPRS technology, completing the upgrade by June 2004 and enabling access across SunCom's footprint.

The company's Southeast operations provided service across North and South Carolina, eastern Georgia, northeastern Tennessee, and southwestern Virginia.

These licenses included the major metropolitan areas of Charlotte, Greensboro, Raleigh-Durham-Cary, and Charleston and in aggregate encompass a population of over 14 million people.