T-Mobile (R) USA Incorporated, founded in 1994 and based in Bellevue, Washington, is the U.S. operating entity of Deutsche Telekom AG & Company's T-Mobile International AG & Company subsidiary. The firm, originally known as VoiceStream Wireless, provides millions of U.S. consumers with mobile, wireless voice, messaging, an data services. The company has deployed over 18,000 hotspots in airports and other public spaces. T-Mobile Connection Manager allows laptops and devices to automatically detect hotspots. T-Mobile USA's T-Mobile Sidekick (R) handheld communications device provides users with voice calling, instant messaging, web surfing, e-mail, color display, and other features. The HiFi Ringers (R) service, launched in 2004, provides consumers with music clip ringtones. T-Mobile USA introduced its T-Mobile SDA and T-Mobile MDA smartphones in 2006. The devices run Microsoft (R) Windows (R) Mobile 5.0 and provide users with information and schedule management applications. The firm also provides customers with batteries, car kits, chargers, routers, memory cards, and other accessories. T-Mobile USA offers consumers subscription and prepaid communications services. Parent company Deutsche Telekom serves 80 million customers worldwide. The firm is listed on the New York Stock Exchange under the DT symbol. T-Mobile USA has won recognition from J.D. Power and Associates.