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  2. SIM lock - Wikipedia

    en.wikipedia.org/wiki/SIM_lock

    A lawsuit was decided in favor of a mobile operator who encouraged the unlocking of phones by providing links to free/cheap unlocking services. [15] T-Mobile Austria charges 150 euros to unlock the iPhone for prepaid subscribers and in contract subscribers.

  3. Type Allocation Code - Wikipedia

    en.wikipedia.org/wiki/Type_Allocation_Code

    The Type Allocation Code (TAC) is the initial eight-digit portion of the 15-digit IMEI and 16-digit IMEISV codes used to uniquely identify wireless devices.. The Type Allocation Code identifies a particular model (and often revision) of wireless telephone for use on a GSM, UMTS, LTE, 5G NR, iDEN, Iridium or other IMEI-employing wireless network.

  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. Mobile network codes in ITU region 3xx (North America)

    en.wikipedia.org/wiki/Mobile_network_codes_in...

    T-Mobile: T-Mobile US: Operational: GSM 1900 / LTE 600 / LTE 700 / LTE 850 / LTE 1900 / LTE 1700 / LTE 2500 / 5G 600 / 5G 1900 / 5G 2500 / 5G 26000 / 5G 28000 / 5G 39000: Former Cook Inlet West Wireless, Voicestream; [142] now universal USA code. Also used for Mint Mobile, [143] Ting. [82] UMTS shut down July 2022, GSM to shut down Sep 2024 ...

  6. iOS jailbreaking - Wikipedia

    en.wikipedia.org/wiki/IOS_jailbreaking

    This includes the iPhone 4S, iPhone 4, iPhone 3GS, and iPhone 3G models. An example of unlocking an iPhone through a Jailbreak utility would be Redsn0w. Through this software, iPhone users will be able to create a custom IPSW and unlock their device. Moreover, during the unlocking process, there are options to install Cydia the iPad baseband.

  7. International Mobile Equipment Identity - Wikipedia

    en.wikipedia.org/wiki/International_Mobile...

    If a user changed their device, they had to register their new IMEI and SIM card. This isn't the case with other CDMA carriers like Verizon which only used allowlists for 3G (which was a requirement for CDMA) and T-Mobile does not use an allowlist but instead a blocklist, including for former Sprint customers.

  8. Bootloader unlocking - Wikipedia

    en.wikipedia.org/wiki/Bootloader_unlocking

    Easy (non-T-Mobile) Medium : Command-line, except on T-Mobile US variants where an unlock code is needed Xiaomi: Hard (outside China Mainland) Very Hard (China Mainland) Add Mi account, request code via Windows-only software, wait for 3 days on HyperOS or 1 week for MIUI (limited to one device per month and three devices per year).

  9. GSM frequency bands - Wikipedia

    en.wikipedia.org/wiki/GSM_frequency_bands

    An at 800/1900 MHz, for a total of 'six' different frequencies (though at most four in a single mode). This allows the same handset to be sold for AT&T Mobility, Verizon, and Sprint in the U.S. as well as a broad range of GSM carriers worldwide such as Vodafone, Orange and T-Mobile (Excluding-US), many of whom offer official unlocking.

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