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2. SIM lock - Wikipedia

   en.wikipedia.org/wiki/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-free or ...

3. Personal unblocking key - Wikipedia

   en.wikipedia.org/wiki/Personal_unblocking_key

   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. Turbo SIM - Wikipedia

   en.wikipedia.org/wiki/Turbo_SIM

   Turbo SIM. Turbo SIM card (also known as TurboSIM or Unlock Chip) is considered to be the forerunner of a large family of "Dual SIM" devices (X-SIM, R-SIM, HyperCard, HyperSIM, China3GPP, StealthSim, MagicSIM, etc.) that piggyback on a mobile telephone SIM card to alter its normal operation. It was introduced on December 1, 2004 by BLADOX ...

5. Cell Phone Freedom Act - Wikipedia

   en.wikipedia.org/wiki/Cell_Phone_Freedom_Act

   November 3, 2011. Status: Not passed. The Cell Phone Freedom Act (formally An Act respecting the locking of cellular telephones) was a private member's bill proposed twice to the Parliament of Canada which would have required mobile phone providers remove the SIM lock from devices once a customer reaches the end of their contract.

6. SIM card - Wikipedia

   en.wikipedia.org/wiki/SIM_card

   SIM cards are identified on their individual operator networks by a unique international mobile subscriber identity (IMSI). Mobile network operators connect mobile phone calls and communicate with their market SIM cards using their IMSIs. The format is: The first three digits represent the Mobile country code (MCC).

7. Free sim cards for Big Issue vendors - AOL

   www.aol.com/free-sim-cards-big-issue-000100216.html

   Big Issue vendors are to be given free sim cards and data vouchers to help them cope with the worsening cost-of-living crisis. Virgin Media O2 announced it will be working with the Big Issue Group ...