The Most Whenever Minutes. No Long Distance Or Roaming Charg. T-Mobile USA is a cellular telecommunications provider and the United States based subsidiary of T-Mobile International AG, itself based in Bonn, Germany. The US company was previously known as VoiceStream Wireless or Powertel. As of 2007, T-Mobile USA has captured at least 11 J.D. Power Awards in the areas of customer care, call quality, and overall customer satisfaction. In particular, it has dominated the wireless industry in the area of customer care and customer satisfaction, winning all customer care and satisfaction awards for all six surveyed regions for five years in a row.