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2. SIM lock - Wikipedia

   en.wikipedia.org/wiki/SIM_lock

   SIM lock. 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 ...

3. GSM - Wikipedia

   en.wikipedia.org/wiki/GSM

   The Global System for Mobile Communications (GSM) is a standard developed by the European Telecommunications Standards Institute (ETSI) to describe the protocols for second-generation (2G) digital cellular networks used by mobile devices such as mobile phones and tablets. GSM is also a trade mark owned by the GSM Association. [2] ".

4. Dual SIM - Wikipedia

   en.wikipedia.org/wiki/Dual_SIM

   Dual SIM phones are mainstream in many countries where phones are normally sold unlocked. Dual SIMs are popular for separating personal and business calls, in locations where lower prices apply to calls between clients of the same provider, where a single network may lack comprehensive coverage, and for travel across national and regional borders.

5. SIM card - Wikipedia

   en.wikipedia.org/wiki/SIM_card

   A typical SIM card (mini-SIM with micro-SIM cutout) T-Mobile nano-SIM card with NFC capabilities in the SIM tray of an iPhone 6s cell phone A SIM (Subscriber Identity Module) card is an integrated circuit (IC) intended to securely store an international mobile subscriber identity (IMSI) number and its related key, which are used to identify and authenticate subscribers on mobile telephone ...

6. GSM frequency bands - Wikipedia

   en.wikipedia.org/wiki/GSM_frequency_bands

   In North America, GSM operates on the primary mobile communication bands 850 MHz and 1900 MHz. In Canada, GSM-1900 is the primary band used in urban areas with 850 as a backup, and GSM-850 being the primary rural band. In the United States, regulatory requirements determine which area can use which band. The term Cellular is sometimes used to ...

7. Galaxy Nexus - Wikipedia

   en.wikipedia.org/wiki/Galaxy_Nexus

   The Canadian model was sold unlocked and supports GSM/UMTS/HSPA/AWS bands. A GSM/UMTS, SIM-unlocked version was officially released in the United States by Google in the Google Play Store. Sprint Corporation officially announced the Galaxy Nexus for their network at CES 2012, and was released on 22 April 2012, as one of Sprint Corporation 's ...