What is a Carrier Lock

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SIM lock:

A sim lock, Network Lock, carrier-lock, IMEI-Lock or (master) SUBSIDY lock is actually a technical limit built into GSM and CDMA cell phones by producers to be used by carrier networks to restrict the usage of these phones to specific countries and/or networks. This is unlike a cell phone (retrospectively called SIM-free or unlocked) which doesn't enforce any SIM limitations.Unlocking a smartphone is practically universally legal. At the same time, it is often legal for service providers to force SIM locks for certain time periods, varying by region.

Unlocking Technology:

Frequently, a locked mobile will show a message if a restricted SIM is used, requesting the unlock code. On recent phone models working on Android software, the phone will display a message stating “SIM network unlock PIN” or “Enter Network Lock Control Key” if it is network locked. Windows phones should display the message, “This SIM card can only be used on specific networks. Contact your customer service center for the unlock code”. Other devices may well show alternative messages such as "Enter special code" or "Enter unlocking code," or in some circumstances the mobile may simply present a message stating that it's locked. Right after a valid code is keyed in, the mobile phone handset displays "Network unlocked” or “Network unlock successful”.


Phone suppliers have financial incentives both to enhance SIM lock protection (which placates network companies and enables exclusivity discounts) and also to weaken it (extending a handset's appeal to customers that are usually not interested in the service provider that offers it). Furthermore, making it very hard to unlock a smartphone might possibly make it a lot less attractive to mobile phone network service providers who've a legal obligation to supply unlock codes for certain handsets or in specific countries.

Unlocking Services:

Various companies provide a on-line cell phone unlocking service . This service calls for individuals that want to unlock a device to give their IMEI number to a service supplier and often they will also require the country and network the mobile phone handset is locked to, either sent via email or submitted on their web site. The organization will then provide (in return for a fee) the unlock code for the mobile.

Unlocking Service Providers:

Unfortunately there are a multitude of scammers sites working in the cell phone network unlocking industry. As a result it is recommended to be certain you find a reliable service provider for these services. To aid with a search for a reputable company, we have supplied an inventory beneath (and in no specific order) of a few legit organisations currently offering such services.

Reputable Mobile Phone IMEI Unlocking Service Providers: