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2. Personal unblocking key - Wikipedia

   en.wikipedia.org/wiki/Personal_unblocking_key

   If the wrong PIN is entered more than three times, the SIM card will become locked. It can be unlocked by entering the PUK code provided by the mobile service provider, [1] which may be available on the SIM card's packaging, the contract, or provided by customer service after identity verification. After the PUK code is entered, the PIN must be ...

3. Bootloader unlocking - Wikipedia

   en.wikipedia.org/wiki/Bootloader_unlocking

   An unlocked bootloader, showing additional available options. Bootloader unlocking is the process of disabling the bootloader security that makes secure boot possible. It can make advanced customizations possible, such as installing custom firmware. On smartphones, this can be a custom Android distribution or another mobile operating system ...

4. SIM lock - Wikipedia

   en.wikipedia.org/wiki/SIM_lock

   If the phone needs to be unlocked within the first six months, the carrier can charge DKK 500 (~ €67) [29] for the unlock. After six months, the carrier is obliged by law to unlock the phone free of charge. But the consumer needs to contact the original supplier, and provide the IMEI and original phone number for which the phone was sold.

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

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

   Former MetroPCS; CDMA2000 1900 / CDMA2000 1700 shut down in 2015; LTE 1700 merged with T-Mobile US [128] 311: 670: Pine Belt Wireless: Pine Belt Cellular Inc. Operational: LTE 700: Alabama; [128] CDMA shut down [189] 311: 680: GreenFly LLC: Unknown: GSM 1900: Iowa [128] [75] 311: 690: TeleBEEPER of New Mexico: Operational: paging: New Mexico ...

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

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

   In general, the types of phones and other devices supported by the MVNOs are in line with the technologies used by the Mobile Network Operator (MNO), the underlying cellular network provider. 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.

7. Metro by T-Mobile - Wikipedia

   en.wikipedia.org/wiki/Metro_by_T-Mobile

   Metro by T-Mobile, formerly known as MetroPCS, and simply known as Metro, is an American prepaid wireless service provider and brand owned by T-Mobile US. It previously operated the fifth largest mobile telecommunications network in the United States using code-division multiple access (CDMA).