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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.
A prepaid mobile device, also known as a pay-as-you-go (PAYG), pay-as-you-talk, pay and go, go-phone, prepay, or burner phone, is a mobile device such as a phone for which credit is purchased in advance of service use. The purchased credit is used to pay for telecommunications services at the point the service is accessed or consumed.
Recent statistics (OECD Communications Outlook 2005) indicate that 40% of the total mobile phone market in the OECD region consists of prepaid accounts. This service was invented by Portuguese provider TMN, while researching for a means to increase penetration of mobile technology by allowing anyone to buy a fully working (usually requiring a quick and simple activation process) mobile phone ...
The history of the prepaid mobile phones began in the 1990s when mobile phone operators sought to expand their market reach. Up until this point, mobile phone services were exclusively offered on a postpaid basis (contract-based), which excluded individuals with poor credit ratings and minors under the age of 18 (the typical age of contractual .)
Comparing plans, Verizon offers its unlimited one-phone plan for $75 a month ($25 more than Consumer Cellular), AT&T’s version of this plan is $65.99 a month ($15.99 more), and T-Mobile’s plan ...
New business models have been used in order to encourage the take up of wireless internet. Prepaid, a concept that has been seen in mobile phones, is being transferred to wireless internet. [citation needed] The major mobile phone networks provide 3G data connectivity using HSDPA over 3GSM. [68]
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