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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.
A dual SIM tray as shown on a Redmi 13. This phone accepts either two nano SIMs or a nano SIM and a MicroSD card in place of the second SIM slot. Some telephones have a primary and a secondary SIM slot that support different generations of connectivity. For example, 4G and 3G primary, and 3G and 2G secondary, [29] or 5G and 5G, or 5G and 4G. [30]
Cellular network standards and generation timeline. This is a comparison of standards of wireless networking technologies for devices such as mobile phones.A new generation of cellular standards has appeared approximately every tenth year since 1G systems were introduced in 1979 and the early to mid-1980s.
The phone, however, is also initially locked by the manufacturer into the Service Provider's MSL. This lock may be disabled so that the phone can use other Service Providers' SIM cards. Most phones purchased outside the U.S. are unlocked phones because there are numerous Service Providers that are close to one another or have overlapping coverage.
UK mobile networks ended SIM lock practices in December 2021. Many businesses offer the ability to remove the SIM lock from a phone, effectively making it possible to then use the phone on any network by inserting a different SIM card. Mostly, GSM and 3G mobile handsets can easily be unlocked and used on any suitable network with any SIM card.
There are three versions of the Samsung Infuse 4G. The first to be released is AT&T's Infuse which is SIM locked. The second is with the Canadian Rogers network, and the third model is intended for China Telecom. The Infuse can be unlocked in a matter of minutes with third party tools. It supports most H+ GSM and 3G providers in the US, Europe ...
This is called SIM locking and is implemented by a software feature of the phone. A subscriber may usually contact the provider to remove the lock for a fee, utilize private services to remove the lock, or use software and websites to unlock the handset themselves. It is possible to hack past a phone locked by a network operator.
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 ...