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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.
When it’s time to buy a new phone, many people head down to their local Verizon, T-Mobile or AT&T store — or their respective booths at Best Buy — to see what’s on the shelves.
Cellular network standards and generation timeline. This is a comparison of standards of wireless networking technologies for devices such as mobile phones.A new generation of cellular standards has appeared approximately every tenth year since 1G systems were introduced in 1979 and the early to mid-1980s.
A nano sim used in mobile phones. One of the key features of GSM is the Subscriber Identity Module, commonly known as a SIM card. The SIM is a detachable smart card [2] containing a user's subscription information and phone book. This allows users to retain their information after switching handsets.
The 4G wireless cellular standard was defined by the ITU and specifies the key characteristics of the standard, including transmission technology and data speeds. Each generation of wireless cellular technology has introduced increased bandwidth speeds and network capacity. 4G has speeds of up to 150 Mbit/s download and 50 Mbit/s upload ...
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.
The phone, however, is also initially locked by the manufacturer into the Service Provider's MSL. This lock may be disabled so that the phone can use other Service Providers' SIM cards. Most phones purchased outside the U.S. are unlocked phones because there are numerous Service Providers that are close to one another or have overlapping coverage.
Frank Pallone (D-NJ) noted that “simply because our nation led the world in providing consumers with access to 4G wireless technology and Wi-Fi does not mean we will achieve the same result in ...
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