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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. This is in contrast to a phone (retrospectively called SIM-free or ...
A mobile phone or cell phone[ a] is a portable telephone that can make and receive calls over a radio frequency link while the user is moving within a telephone service area, as opposed to a fixed-location phone ( landline phone ). The radio frequency link establishes a connection to the switching systems of a mobile phone operator, which ...
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.
If you buy a phone through T-Mobile or Sprint, or buy Apple’s unlocked, SIM-free version, the pricing is $729 for the 12 Mini and $829 for the 12. You only save that $30 if you buy it for AT&T ...
Will Lipman. Apple has started selling SIM-free iPhone 7 and 7 Plus -- on its US website, at least -- just like it did for the previous models. It's the way to go if you'd rather not be tied down ...
Dual SIM Phones. There are compromises to needing more than one phone. One that has been gaining popularity is the dual SIM phone. Kent German at CNET explains the many benefits of owning a dual ...
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