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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 ...
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#
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.
Unstructured Supplementary Service Data (USSD), sometimes referred to as "quick codes" or "feature codes", is a communications protocol used by GSM cellular telephones to communicate with the mobile network operator's computers.
Mobile phones use geographic area codes (two digits): after that, all numbers assigned to mobile service have nine digits, starting with 6, 7, 8 or 9 (example: 55 15 99999–9999). 90 is not possible, because collect calls start with this number.
Comparison of mobile phone standards; List of sovereign states by number of broadband Internet subscriptions; List of countries by number of Internet users; List of countries by number of telephone lines in use; List of countries by smartphone penetration; List of multiple-system operators; List of telecommunications companies
A mobile network operator (MNO), also known as a mobile network provider, mobile network carrier, mobile telco, wireless service provider, wireless carrier, wireless operator, wireless telco, or cellular company, [a] is a telecommunications provider of services that sells, delivers and maintains mobile telephony services to an end user.
In the United Kingdom, these are over 600 area code or local exchange codes 01 & 02 numbers which can be set up as virtual numbers as well as the 0800 & 0345. A virtual number is a telephone number that is not directly associated with a telephone line. It is used to forward incoming calls to one or more pre-set telephone numbers chosen by the ...