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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.
After switching on the phone, if the PIN security function is active, the user is required to enter a 4-8 digit PIN to unlock the SIM card and connect to the mobile network. Without this, functions such as phone calls (except for emergency calls), text messages and mobile data will not be available.
S. 517 would repeal a rule published in October 2012 by the Librarian of Congress (LOC) that limited the ability of certain owners of wireless telephone handsets to "unlock" their phones, that is, to circumvent software protections that prevent the owner from connecting to a different wireless network. The bill would reinstate an earlier rule ...
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.
The Type Allocation Code (TAC) is the initial eight-digit portion of the 15-digit IMEI and 16-digit IMEISV codes used to uniquely identify wireless devices.. The Type Allocation Code identifies a particular model (and often revision) of wireless telephone for use on a GSM, UMTS, LTE, 5G NR, iDEN, Iridium or other IMEI-employing wireless network.
While the iPhone was initially sold in the U.S. only on the AT&T network with a SIM lock in place, various hackers found methods to bypass that SIM lock. [121] More than a quarter of first-generation iPhones sold in the U.S. were not registered with AT&T. Apple speculated that they were likely shipped overseas and unlocked, a lucrative market ...
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