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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. Comparison of mobile phone standards - Wikipedia

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

    4G: OFDMA: LTE: Digital: 2009 Worldwide SIM card: None Smaller cells and lower coverage on the S band. Very low density Hard No (data only) Voice possible through VoLTE or fallback to 2G/3G 5G: OFDMA: NR: Digital: 2018 Limited SIM card: None Dense cells on millimeter waves. Very low density Hard No (data only) Voice possible through VoNR

  4. Dual SIM - Wikipedia

    en.wikipedia.org/wiki/Dual_SIM

    A dual SIM tray as shown on a Redmi 13. This phone accepts either two nano SIMs or a nano SIM and a MicroSD card in place of the second SIM slot. Some telephones have a primary and a secondary SIM slot that support different generations of connectivity. For example, 4G and 3G primary, and 3G and 2G secondary, [29] or 5G and 5G, or 5G and 4G. [30]

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

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

    All major and regional MNOs use 4G LTE / LTE Advanced and 5G NR protocols (2G and 3G having been deprecated and shut down), with GSM technologies. However, many MVNOs tend to sell somewhat older phone models (e.g. ones discontinued by the host networks), which can affect whether all technologies supported by the carrier network are usable by ...

  6. Samsung Infuse 4G - Wikipedia

    en.wikipedia.org/wiki/Samsung_Infuse_4G

    There are three versions of the Samsung Infuse 4G. The first to be released is AT&T's Infuse which is SIM locked. The second is with the Canadian Rogers network, and the third model is intended for China Telecom. The Infuse can be unlocked in a matter of minutes with third party tools. It supports most H+ GSM and 3G providers in the US, Europe ...

  7. GSM - Wikipedia

    en.wikipedia.org/wiki/GSM

    This is called SIM locking and is implemented by a software feature of the phone. A subscriber may usually contact the provider to remove the lock for a fee, utilize private services to remove the lock, or use software and websites to unlock the handset themselves. It is possible to hack past a phone locked by a network operator.

  8. List of wireless network technologies - Wikipedia

    en.wikipedia.org/wiki/List_of_wireless_network...

    CDMA2000 is a family of 3G mobile technology standards for sending voice, data, and signaling data between mobile phones and cell sites. It is a backwards-compatible successor to second-generation cdmaOne (IS-95) set of standards and used especially in North America and South Korea, China, Japan, Australia and New Zealand.

  9. 3G - Wikipedia

    en.wikipedia.org/wiki/3G

    Note however that there is a distinction between a phone with mobile-broadband connectivity and a smart phone with a large display and so on—although according [24] to the ITU and informatandm.com the US has 321 million mobile subscriptions, including 256 million that are 3G or 4G, which is both 80% of the subscriber base and 80% of the US ...

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