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  2. List of mobile network operators in the United States

    en.wikipedia.org/wiki/List_of_mobile_network...

    Each active SIM card is considered a subscriber. [7] Wholesale customers include users of machine to machine networks and mobile virtual network operators that operate on the host network, but are managed by wholesale partners. Subscriber counts are sourced from each companies quarterly reports.

  3. Viettel - Wikipedia

    en.wikipedia.org/wiki/Viettel

    The Military Industry and Telecoms Group (Vietnamese: Tập đoàn Công nghiệp - Viễn thông Quân đội, lit. 'the Army Industry - Telecommunications Group'), [3] [4] trading as Viettel or Viettel Group (Tập đoàn Viettel), is a Vietnamese state-owned multinational telecommunications, technology and manufacturing conglomerate headquartered in Hanoi, Vietnam.

  4. Voice over IP - Wikipedia

    en.wikipedia.org/wiki/Voice_over_IP

    Voice over Internet Protocol (VoIP), [a] also known as IP telephony, refers to a set of technologies used for voice communication sessions over Internet Protocol (IP) networks, such as the Internet. [2]

  5. SIM box - Wikipedia

    en.wikipedia.org/wiki/Sim_box

    SIM box operators often swap SIMs to replace restricted ones. They may also rewrite the International Mobile Equipment Identity (IMEI) of the SIM box, often using randomized IMEIs in ranges of or those assigned to common mobile phones to evade detection. The use of SIM boxes is often legal, but the use may constitute breach of carrier contracts.

  6. Mobile number portability - Wikipedia

    en.wikipedia.org/wiki/Mobile_number_portability

    sim card of the new mobile company that will cost around 15 PEN. United States: 2003.11.24 0 Free iconectiv manages the Number Portability Administration Center (NPAC), the largest number portability system in the world. Consisting of seven regional systems, the NPAC facilitates number porting across all Service Providers in the United States.

  7. GoIP - Wikipedia

    en.wikipedia.org/wiki/GoIP

    - fast connection of SIM cards to the gateway, rapid exchange of SIM-cards via the Internet, and their prearranged synchronous replacement. The cooperative use of GoIP gateways and GoIP SIM-bank enables the management of unmanned devices and reduces the work pressure in SIM-cards operations, for example, SIM-cards replacement and replenishment.

  8. Mobile virtual network operator - Wikipedia

    en.wikipedia.org/wiki/Mobile_virtual_network...

    The Medium MVNO, operates under its own brand with its own SIM cards, marketing, sales, distribution, and can in some countries obtain its own numbering range/mobile network code. The Medium MVNO has the ability to set tariff bundles and packages independently from the retail prices set by the host network operator (MNO).

  9. Voice over LTE - Wikipedia

    en.wikipedia.org/wiki/Voice_over_LTE

    VoLTE calling. Voice over Long-Term Evolution (acronym VoLTE) is an LTE high-speed wireless communication standard for voice calls and SMS using mobile phones and data terminals. [1] [2] VoLTE has up to three times more voice [3] and data capacity than older 3G UMTS and up to six times more than 2G GSM.