T-Mobile USA is a major wireless cellphone carrier in the United States.  It is 2/3's owned by Deutsche Telekom AG, a large German communications firm, even though it trades on the New York Stock Exchange under the ticker symbol TMUS.

The mother company, Deutsche Telekom Based in Bonn, Germany, has subsidiaries who operate GSM, UMTS and LTE-based cellular networks in Europe, the United States, Puerto Rico and the U.S. Virgin Islands. The company has financial stakes in mobile operators in both Central and Eastern Europe.

Their motto is to connect folks: The value of our plans, the breadth of our coverage, the reliability of our network, and the quality of our service are meant to do one thing: help you stick together with the people who make your life come alive. That's why we're here.

T-Mobile runs T-mobile.com and has been a pioneer in preventing unforeseen cell phone bill shock, with their overage plans. Overage alerts help customers avoid unexpected high wireless bills when they have a limited number of minutes, messages, and or data.

T-Mobile has a pretty standard phone unlocking policy for those on a monthly plan.

• The device must have been active on the T-Mobile network for at least 40 days on the requesting line.
• If the device was financed using T-Mobile’s Equipment Installment Plan (EIP), then all payments must be satisfied and the device must be paid in full.
• If the device is on an account that has are under a service contract term, then at least 18 consecutive monthly payments must have been made or the account was migrated to Simple Choice no contract rate plan.
• If the device is associated with a canceled account, then the account balance must be zero.
• T-Mobile may request proof of purchase or additional information in its discretion and certain other exceptions may apply.

Per Wikipedia: T-Mobile US provides wireless voice, messaging, and data services in the United States, Puerto Rico and the U.S. Virgin Islands under the T-Mobile, MetroPCS and GoSmart Mobile brands. The company operates the third largest wireless network in the U.S. market with over 61.2 million customers and annual revenues of $29.56 billion.Its nationwide network reaches 98 percent of Americans, through its EDGE 2G/HSPA 3G/HSPA+ 4G/4G LTE networks, as well as through roaming agreements (see section: Radio frequency spectrum chart). As of 2011, J. D. Power and Associates, a global marketing-information-services firm, ranked the company highest among major wireless carriers for retail-store satisfaction four years consecutively and highest for wireless customer care two years consecutively.

The company owns licences to operate a 1900 MHz GSM PCS digital cellular network and a 1700 MHz UMTS AWS digital cellular network that cover areas of the continental U.S., Alaska, Hawaii, Puerto Rico and the U.S. Virgin Islands. It provides coverage in areas where it does not own radio frequency spectrum licenses via roaming agreements with other operators of compatible networks. In addition to its cellular mobile network, T-Mobile US operates a nationwide Wi-Fi Internet-access network under the T-Mobile HotSpots brand. The T-Mobile HotSpot service offers access to a nationwide network of approximately 8,350 access points, installed in venues such as Starbucks coffeehouses, FedEx Office Office and Print Centers, Hyatt hotels and resorts, Red Roof Inns, Sofitel hotels, Novotel hotels, the airline clubs of American Airlines, Delta Air Lines, United Airlines and US Airways, and airports.

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• Company Vital Information:
• Company Name: T-Mobile
• Headquarters Phone: 800-866-2453
• Corporate Address:
  P.O. Box 37380
  Albuquerque, NM 87176-7380 USA
• Payment Accepted: Visa, MasterCard, American Express and Discover
• Sales tax in: Most States
• Shipping: Ground, Air
• Return policy: 30 days/14 days for discounted items
• Information subject to change. Contact us with any updates.