What is a SIM lock

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SIM lock:

A SIM-Lock, NETWORK-LOCK, CARRIER LOCK, imei-lock or (master) SUBSIDY lock is really a technical limitation built into GSM and CDMA cellular phones by manufacturers to be used by carrier networks to restrict the use of these phones to specific countries and/or networks. This is not like a mobile phone (retrospectively called SIM-free or unlocked) that doesn't impose any SIM constraints.

The vast majority of cell phones can be unlocked to work with any GSM network provider, however phone might still display the original branding and may not support popular features of the new service provider. Apart from the locking, cell phones might also have firmware that come with them which is specific to the network provider. This firmware is installed through the service provider and is separate from the locking mechanism. Nearly all handsets can be unbranded by re-flashing a new firmware version, an operation suited to advanced users only.

Unlocking Technology:

Commonly, a locked phone will show a message if a restricted SIM is used, asking for the unlock code. On modern phone models working on Google android software, the phone is going to show a message stating “SIM network unlock PIN” or “Enter Network Lock Control Key” if it's network locked. Now you're absolutely clear on what an I.M.E.I. number is and how you may recover it from a mobile phone, but what can you do with it? The number one functions of getting your I.M.E.I. number is to allow a cellphone to get unlocked so it can be used with another network carrier, doubtlessly saving you big by switching to a cheaper network. If you decide you're ready to unlock your cell phone, you've established your cellphone is not Blacklisted, and you would like to use it on another network carrier, then the most reliable website to get Easiest Way To Network Unlock Any Kind Of Phone is Unlock.Zone - ensure you google them!Windows phones are going to show the message, “This SIM card can only be used on specific networks. Contact your customer service center for the unlock code”. Alternative models may very well show assorted messages for example "Enter special code" or "Enter unlocking code," or in some instances the mobile will probably display a message saying it's locked. After a valid code is entered, the phone will display "Network unlocked” or “Network unlock successful”.


The primary reason to unlock a handset is usually to be able to utilize it with another SIM card. Consumers might like to continue using their mobile phone but with a different service or if traveling in another country they may wish to connect to a overseas network by using a pay as you go subscription.

Unlocking Services:

Quite a few organizations provide a IMEI unlocking service . This service calls for all those that want to unlock a device to give their IMEI number to a service supplier and often they will also need the country and network the mobile phone handset is locked to, either sent through email or entered on their web site. The organization will then supply (in return for a fee) an unlock code for the device. For a lot of brands as in Nokia and Samsung many services additionally offer unique remote-unlocking software with instructions, where a cable is needed to remove the SIM lock at home. Such vendors may email the unlocking code or software that will remotely unlock the unit. The cost for unlocking a telephone can vary depending on the mobile phone network it is locked to and the mobile phone model itself, as every unlock code is unique to each unique handset.

Unlocking Service Providers:

Unfortunately there are many of fraudulent organizations working in the smart-phone network unlocking industry. As a result it is recommended to be certain you use a genuine service provider for these services. To aid with a search for a trustworthy service provider, we have supplied an inventory just below (and in no specific order) of several genuine organizations currently offering such services.

Reputable Mobile Phone IMEI Unlocking Service Providers: