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SIM lock:

A SIM-LOCK, Network-Lock, carrier-lock, IMEI LOCK or (MASTER) subsidy lock is a technical restriction built into GSM and CDMA cellular phones by manufacturers to be used by service providers to restrict the use of these phones to specific locations and/or networks. This is unlike a mobile phone (retrospectively called SIM-free or unlocked) that does not enforce any SIM limitations.SIM locking is really common if subsidized devices are sold with pre-paid contracts. It is really important to note, however, that the technology accompanying with the cellphone has to be compatible with the technology used by the network carrier. A GSM mobile phone will only function with a GSM carrier and will not work on a CDMA service. Similarly, a CDMA cell phone can only work with a CDMA network and is not going to function on a GSM service. Be aware that more recent (2013 and newer) more costly cell phones are capable of supporting both CDMA and GSM technologies, permitting consumers to utilize their smartphones on pretty much any network.

Unlocking Technology:

A handset can be unlocked simply by entering a code supplied by the service operator. Alternative mechanisms contain software operating on the device or a computer connected to the device, hardware devices that attach to the mobile or over-the-air by the carrier. Most of the time the unlock procedure is permanent. The code needed to eliminate all locks from a phone is known as the master code, network code key, or multi-lock code. If the device is carrier locked it will usually display one of the following messages: SIM network PIN blocked, Enter lock PIN.


Device suppliers have economic incentives both to bolster SIM lock security (which placates network companies and will allow exclusivity deals) and to weaken it (increasing a phone's appeal to consumers that typically are not interested in the service provider that offers it). Additionally, making it too difficult to unlock a smartphone may possibly make it much less attractive to mobile phone network service providers who've a legal duty to supply unlock codes for certain handsets or in particular countries.

Unlocking Services:

Lots of organizations offer a online phone unlocking service . This service requires individuals that need to unlock a device to provide their IMEI number to a unlocking company and often they will also need the country and cellular network the handset is locked to, sometimes sent through email or entered on their web site. The supplier will then supply (in return for a fee) a unlock code for the handset. For a few brands such as Nokia and Samsung a variety of services additionally offer unique remote-unlocking software with guidance, where a cable connection is required to remove the SIM lock from home. Such organizations may email the unlocking code or software that will remotely unlock the unit. The price for unlocking a cell phone may differ based on the network it's locked to and the device model itself, as each unlock code is unique to each individual handset.

Unlocking Service Providers:

Unfortunately there are many of scammers on line retailers operating in the smartphone carrier unlocking industry. Consequently it is prudent to be sure you use a reliable provider for such a service. Do your due diligence and investigate any prospective suppliers before committing to making an order. In the case of online providers, make sure they publish their registered organization name and corresponding registration details (every legitimate enterprise has to be lawfully registered with the official governing bodies within their country of origin) and make sure they supply a legitimate listed address and contact details on their website. Furthermore make sure that any payments made are done so via legitimate sources for example a recognized bank or financial institution using a debt or credit card, but never make payment via a direct transfer because this provides no fiancial safety. To assist with your search for a reputable company, we have provided a checklist below (and in no specific order) of a number of legit organizations currently offering such services.

Reputable Mobile Phone IMEI Unlocking Service Providers: