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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.
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 ...
With the i920 or the i930, one phone, one phone number can be used at any part of the world which has a GSM network. The phone won't be made available to either Boost Mobile or Southern Linc networks, given that Boost Mobile is a prepaid service and Southern Linc is a regional carrier serving mainly Alabama and Georgia.
In a GSM network, the UICC contains a SIM application and in a UMTS network, it contains a USIM application. A UICC may contain several applications, making it possible for the same smart card to give access to both GSM and UMTS networks, and also provide storage of a phone book and other applications. It is also possible to access a GSM ...
The lawsuit further stated that "AT&T and Cricket had decided to discontinue the CDMA network and require Cricket customers to use AT&T's GSM cellular network" yet continued to sell the devices, and due to Cricket's policy of not unlocking cellphones at that time, "the cellphones became useless and worthless."
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.
Each active SIM card is considered a subscriber. [7] Wholesale customers include users of machine to machine networks and mobile virtual network operators that operate on the host network, but are managed by wholesale partners. Subscriber counts are sourced from each companies quarterly reports.
The card also contains SIM (GSM) application, so it can work on both networks. It is physically compatible with GSM SIMs and can fit into existing GSM phones as it is an extension of the GSM 11.11 standard. [1] This interface brings one of the main advantages of GSM to CDMA network phones. By having a removable identity card, CDMA users can ...
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