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2. List of mobile virtual network operators in the United States

   en.wikipedia.org/wiki/List_of_mobile_virtual...

   Mobile virtual network operators (MVNOs) in the United States lease wireless telephone and data service from the four major cellular carriers in the country—AT&T Mobility, Boost Mobile, T-Mobile US, and Verizon—and offer various levels of free and/or paid talk, text and data services to their customers.

3. Mobile VoIP - Wikipedia

   en.wikipedia.org/wiki/Mobile_VoIP

   Mobile VoIP or simply mVoIP is an extension of mobility to a voice over IP network. Two types of communication are generally supported: cordless telephones using DECT or PCS protocols for short range or campus communications where all base stations are linked into the same LAN, and wider area communications using 3G or 4G protocols.

4. Ding (company) - Wikipedia

   en.wikipedia.org/wiki/Ding_(company)

   Ding is an international mobile recharge service, allowing users to send mobile top-up to friends and family in over 150 countries and across more than 500 global operators. [ 2 ] [ 3 ] History

5. Line2 - Wikipedia

   en.wikipedia.org/wiki/Line2

   Line2 also offers a mobile app for Apple iOS and Android phones called Line2. Line2 is a mobile VoIP app, which means that, although it is on a mobile device, it uses an Internet Protocol address to make calls. This results in cheaper, sometimes stronger service.

6. Voip-Pal.com Inc. Mobile Gateway Application Provides the ...

   www.aol.com/news/2013-09-09-voip-palcom-inc...

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7. Ultra Mobile - Wikipedia

   en.wikipedia.org/wiki/Ultra_Mobile

   Ultra Mobile is a mobile virtual network operator (MVNO) that uses the T-Mobile US network. Customers can choose the number of minutes, text messages, or data that can be used via a prepaid mobile phone plan.