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2. Vertical service code - Wikipedia

   en.wikipedia.org/wiki/Vertical_service_code

   On a touch tone telephone, the codes are usually initiated with the star key, resulting in the commonly used name star codes. On rotary dial telephones, the star is replaced by dialing 11 . In North American telephony , VSCs were developed by the American Telephone and Telegraph Company (AT&T) as Custom Local Area Signaling Services ( CLASS or ...

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

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

   This list contains the mobile country codes and mobile network codes for networks with country codes between 300 and 399, inclusively – a region that covers North America and the Caribbean. Guam and the Northern Mariana Islands are included in this region as parts of the United States.

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. Add or disable 2-step verification for extra security - AOL Help

   help.aol.com/articles/2-step-verification...

   We'll send you a text or call you with a new code that needs to be entered at sign-in. The phone number we contact you with may be different each time. Enable 2-step for phone. 1. Sign in to your Account Security page. 2. Next to "2-Step Verification," click Turn on. 3. Select Phone number for your 2-step verification method. 4.

6. 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 ...

7. SIM lock - Wikipedia

   en.wikipedia.org/wiki/SIM_lock

   Depending on the carrier which the phone is locked to, only some codes will work with the mobile phone. Most phones respond to the unlock codes ending in +1# or +7#, however some phones are configured to allow only one of the seven codes to work. The following is an example of a DCT4/DCT3 unlock code: # pw+931882753035021+7#