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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. This is in contrast to a phone (retrospectively called SIM-free or ...

3. 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 / UMTS 1900 / UMTS 1700 / LTE 850 / LTE 700 / LTE 1900 / LTE 1700 / 5G 600: Former Cook Inlet West Wireless, Voicestream; ...

4. Personal unblocking key - Wikipedia

   en.wikipedia.org/wiki/Personal_unblocking_key

   A personal unblocking key ( PUK ), sometimes called personal unblocking code ( PUC ), is used in SIM cards to reset a personal identification number (PIN) that has been lost or forgotten. Most mobile phones offer the feature of PIN protection. After switching on the phone, if the PIN security function is active, the user is required to enter a ...

5. SIM card - Wikipedia

   en.wikipedia.org/wiki/SIM_card

   SIM cards are identified on their individual operator networks by a unique international mobile subscriber identity (IMSI). Mobile network operators connect mobile phone calls and communicate with their market SIM cards using their IMSIs. The format is: The first three digits represent the Mobile country code (MCC).

6. T-Mobile myTouch 4G - Wikipedia

   en.wikipedia.org/wiki/T-Mobile_myTouch_4G

   The T-Mobile myTouch 4G is a smartphone designed and manufactured by HTC Corporation for T-Mobile USA 's "myTouch" re-branded series of phones. HTC's name for the device during development was "Glacier". This is T-Mobile's second "4G" phone, after the T-Mobile G2, and the third smartphone by T-Mobile that runs Android 2.2 Froyo software. [3]

7. 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 ...