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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 ...
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 4-8 ...
The International Mobile Equipment Identity (IMEI) [1] is a numeric identifier, usually unique, [2][3] for 3GPP and iDEN mobile phones, as well as some satellite phones. It is usually found printed inside the battery compartment of the phone but can also be displayed on-screen on most phones by entering the MMI Supplementary Service code *#06 ...
Dual SIM. A modern Samsung Galaxy phone with two SIM card slots. It uses nano-SIM instead of the normal sized SIM. Some mobile phones support use of two SIM cards, described as dual SIM operation. When a second SIM card is installed, the phone may allow users to switch between two separate mobile network services manually, have hardware support ...
SIM box operators often swap SIMs to replace restricted ones. They may also rewrite the International Mobile Equipment Identity (IMEI) of the SIM box, often using randomized IMEIs in ranges of or those assigned to common mobile phones to evade detection. The use of SIM boxes is often legal, but the use may constitute breach of carrier contracts.
IMSI-catcher. An international mobile subscriber identity-catcher, or IMSI-catcher, is a telephone eavesdropping device used for intercepting mobile phone traffic and tracking location data of mobile phone users. [1] Essentially a "fake" mobile tower acting between the target mobile phone and the service provider's real towers, it is considered ...
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