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  2. SIM lock - Wikipedia

    en.wikipedia.org/wiki/SIM_lock

    A SIM lock, simlock, network lock, carrier lock or (master) subsidy lock is a technical restriction built into GSM and CDMA [1] mobile phones by mobile phone manufacturers for use by service providers to restrict the use of these phones to specific countries and/or networks.

  3. Code-division multiple access - Wikipedia

    en.wikipedia.org/wiki/Code-division_multiple_access

    A CDMA2000 mobile phone. Synchronous CDM (code-division 'multiplexing', an early generation of CDMA) was implemented in the Global Positioning System (GPS). This predates and is distinct from its use in mobile phones. The Qualcomm standard IS-95, marketed as cdmaOne.

  4. Cellular frequencies in the United States - Wikipedia

    en.wikipedia.org/wiki/Cellular_frequencies_in...

    As cellular mobile telephone technology has evolved over time, periodically bands of frequencies are reassigned from other radio services. Companies wishing to provide cellular services in a geographic region compete for the right to license radio spectrum in spectrum auctions. Different cellular companies in the same region may use different ...

  5. Cellular frequencies - Wikipedia

    en.wikipedia.org/wiki/Cellular_frequencies

    In Russia and some other countries, local carriers received licenses for 450 MHz frequency to provide CDMA mobile coverage area. Many GSM phones support three bands (900/1,800/1,900 MHz or 850/1,800/1,900 MHz) or four bands (850/900/1,800/1,900 MHz), and are usually referred to as tri-band and quad-band phones, or world phones ; with such a ...

  6. Comparison of mobile phone standards - Wikipedia

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

    Cellular network standards and generation timeline. This is a comparison of standards of wireless networking technologies for devices such as mobile phones.A new generation of cellular standards has appeared approximately every tenth year since 1G systems were introduced in 1979 and the early to mid-1980s.

  7. The Best Cheap Cell Phone Plans for 2022 - AOL

    www.aol.com/best-cheap-cell-phone-plans...

    The Cheapest Cell Phone Plans of 2022. People need cell phones for varying reasons and different levels of use. ... This cheaper cell phone plan is part of the new Connect by T-Mobile plans.

  8. Removable User Identity Module - Wikipedia

    en.wikipedia.org/wiki/Removable_User_Identity_Module

    Removable User Identity Module (R-UIM, usually pronounced as "R-yuim") is a card developed for cdmaOne/CDMA2000 ("CDMA") handsets that extends the GSM SIM card to CDMA phones and networks. To work in CDMA networks, the R-UIM contains an early version of the CSIM application. The card also contains SIM (GSM) application, so it can work on both ...

  9. 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 ...

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