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  2. Mobile phone signal - Wikipedia

    en.wikipedia.org/wiki/Mobile_phone_signal

    A mobile phone signal (also known as reception and service) is the signal strength (measured in dBm) received by a mobile phone from a cellular network (on the downlink). Depending on various factors, such as proximity to a tower , any obstructions such as buildings or trees, etc. this signal strength will vary.

  3. List of mobile network operators in the United States

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

    Four of the top five carriers have enabled VoLTE and VoNR on their networks, while Boost uses strictly VoNR. AT&T, T-Mobile, Verizon, Boost Mobile, and U.S. Cellular also sell SIM cards through their retail channels, both in-store and online.

  4. 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.

  5. The Best Cell Phone Providers: What’s Worth the Cost? - AOL

    www.aol.com/finance/best-cell-phone-providers...

    The number one cell phone carrier would depend on your budget and data requirements. Some carriers to consider would be Mint, Verizon and T-Mobile as they top our list in each area.

  6. Assurance Wireless - Wikipedia

    en.wikipedia.org/wiki/Assurance_Wireless

    According to Hotspot Setup, "the two largest providers of free mobile phones are Safelink Wireless and Assurance Wireless, which are available in more states than other providers." [ 6 ] Assurance Wireless users may bring their own unlocked device – they are not required to use an Assurance issued wireless phone. [ 7 ]

  7. The 4 Best Cheap Cell Phone Plans Under $30 with Data - AOL

    www.aol.com/finance/4-best-cheap-cell-phone...

    Plan Name. Mint Mobile Unlimited. Data. Unlimited. Talk & Text. Unlimited. Contract. No. Price. $30/month. If you want a cheap cell phone plan without any second thoughts, Mint Mobile is the solid ...

  8. Signal strength in telecommunications - Wikipedia

    en.wikipedia.org/wiki/Signal_strength_in...

    The electric field strength at a specific point can be determined from the power delivered to the transmitting antenna, its geometry and radiation resistance. Consider the case of a center-fed half-wave dipole antenna in free space, where the total length L is equal to one half wavelength (λ/2). If constructed from thin conductors, the current ...

  9. Comparison of mobile phone standards - Wikipedia

    en.wikipedia.org/wiki/Comparison_of_mobile_phone...

    In reality, only one person is actually using the channel at a specific moment. This is analogous to time-sharing on a large computer server. Frequency-division multiple access (FDMA) provides multiuser access by separating the used frequencies. This is used in GSM to separate cells, which then use TDMA to separate users within the cell.