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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 4-8 ...
Unstructured Supplementary Service Data(USSD), sometimes referred to as "quick codes" or "feature codes", is a communications protocolused by GSMcellular telephonesto communicate with the mobile network operator's computers. USSD can be used for WAPbrowsing, prepaid callback service, mobile-money services, location-based content services, menu ...
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A toll-free telephone number or freephone number is a telephone number that is billed for all arriving calls. For the calling party, a call to a toll-free number from a landline is free of charge. A toll-free number is identified by a dialing prefix similar to an area code. The specific service access varies by country.
To promote consumer choice and wireless competition by permitting consumers to unlock mobile wireless devices, and for other purposes. Announced in: the 113th United States Congress: Sponsored by: Sen. Patrick J. Leahy (D, VT) Number of co-sponsors: 5: Citations; Public law: Pub. L. Tooltip Public Law (United States) 113–144 (text ...
As of 2007, text messaging was the most widely used mobile data service, with 74% of all mobile phone users worldwide, or 2.4 billion out of 3.3 billion phone subscribers, being active users of the Short Message Service at the end of 2007. In countries such as Finland, Sweden, and Norway, over 85% of the population used SMS.
The mobile operator said it would offer Sim cards with 20GB of free data each month for six months, as well as access to free calls and texts. Vodafone to offer free mobile connectivity to 200,000 ...
Vodafone Limited, trading as Vodafone UK, is a British telecommunications company, owned by Vodafone Group, the world's eighth-largest telecommunications company. [ 3 ] Vodafone is the third-largest mobile network operator in the United Kingdom, with 18.5 million subscribers as of July 2024, [ 4 ] after O2 and EE, followed by Three. [ 5 ]