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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 lock bypass is a technique in lockpicking, of defeating a lock through unlatching the underlying locking mechanism without operating the lock at all. It is commonly used on devices such as combination locks, where there is no natural access (such as a keyhole) for a tool to reach the locking mechanism.
As a result, only phones that were purchased before or within 90 days of the effective date could continue to be unlocked by users. Phones purchased more than 90 days past the effective date would again be subject to the anti-circumvention clause of the DMCA and could not be legally unlocked without the carrier's permission. [4] [1]
An unlocked bootloader, showing additional available options. Bootloader unlocking is the process of disabling the bootloader security that makes secure boot possible. It can make advanced customizations possible, such as installing custom firmware.
Rooting allows the user to obtain privileged access to a phone. It does not allow a user to install a new OS (custom firmware or custom ROM) or recovery image, and it doesn't allow a phone that is locked to a certain carrier to be used on another one. Related operations allow these.
iOS jailbreaking is the use of a privilege escalation exploit to remove software restrictions imposed by Apple on devices running iOS and iOS-based [a] operating systems. It is typically done through a series of kernel patches.
A SIM swap scam (also known as port-out scam, SIM splitting, [1] simjacking, and SIM swapping) [2] is a type of account takeover fraud that generally targets a weakness in two-factor authentication and two-step verification in which the second factor or step is a text message (SMS) or call placed to a mobile telephone.
In telecommunications, the term bypass has these meanings: The use of any telecommunications facilities or services that circumvents those of the local exchange common carrier. Note: Bypass facilities or services may be either customer-provided or vendor-supplied. An alternate circuit that is routed around equipment or a system component.