Metro by T-Mobile is a wireless telecommunications carrier that offers wireless broadband mobile services in the United States. The company's services comprise voice services that allow customers to place voice calls to, and receive calls from, any telephone in the world, including local, domestic long distance, and international calls; data services, such as ringtones, ring back tones, games and content applications, text and multimedia messaging services, mobile Internet browsing, mobile instant messaging, location based services, social networking services, and push e-mail; and custom calling features consisting of caller ID, call waiting, three-way calling, and voicemail. It also sells mobile handsets. The company sells its products and services, under the MetroPCS brand name, directly through company-operated retail stores and indirectly through independent retail outlets, as well as through Internet. As of December 31, 2009, it operated approximately 153 retail stores in the metropolitan areas of Atlanta, Boston, Dallas/Ft. Worth, Detroit, Las Vegas, Los Angeles, Miami, New York, Orlando/Jacksonville, Philadelphia, Sacramento, San Francisco, and Tampa/Sarasota. The company is headquartered in Richardson, Texas.