What is a SIMLock

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SIM lock:

A simlock, Network Lock, carrier lock, imei lock or (Master) subsidy lock is a technical constraint built into CDMA and GSM mobile phone devices by manufacturers for use by carrier networks to restrict using these phones to particular countries and/or networks. This is contrary to a cell phone (retrospectively called SIM-free or unlocked) that does not enforce any SIM limitations.The key reason why quite a few carriers SIM lock their smartphones is because they offer smartphones at a discount to customers in return for for a contract to pay for the use of the network for a specified timeframe, commonly between one and three years. This business model permits the business to recover the price of the cell phone covering the lifetime of the agreement. These reductions are worth around a couple of hundred US dollars.

Unlocking Technology:

Frequently, a locked phone will display a message if a restricted SIM is used, requesting the unlock code. On the latest phone models working on Google android software, the smartphone will display a message saying “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”. Alternative handsets might show alternative messages that include "Enter special code" or "Enter unlocking code," or in some cases the mobile will simply show a message saying it's locked. After a valid code is keyed in, the device displays "Network unlocked” or “Network unlock successful”.


Smartphone companies have financial incentives both to bolster SIM lock protection (which placates service companies and permits exclusivity offers) as well as to weaken it (expanding a mobile's overall appeal to users who typically are not interested in the provider that offers it). Moreover, making it too difficult to unlock a phone could possibly make it less desirable to mobile phone network service providers who have a legal duty to offer unlock codes for certain handsets or in certain countries.

Unlocking Services:

Some organizations offer a remote unlocking service . This service calls for individuals that need to unlock a mobile to give their IMEI number to a service supplier and often they will also ask for the country and cellular network the handset is locked to, frequently sent by email or entered on their web site. The organization will then supply (once you have paid) an unlock code for the phone. For a lot of manufacturers for instance Nokia and Samsung a variety of services additionally supply special remote-unlocking software with guidance, where a cable connection is necessary to remove the SIM lock from home. Such organizations may email the unlocking code or software which will remotely unlock the device. The price for unlocking a cell phone may fluctuate dependent upon the network it's locked to and the mobile phone model itself, as every unlock code is unique to each specific handset.

Unlocking Service Providers:

Regrettably there are many of dodgy "businesses" working in the cellphone carrier unlocking industry. Consequently it pays to be certain you locate a reputable supplier for these services. To aid with the search for a trustworthy supplier, we have provided a listing just below (and in no specific order) of several genuine organizations currently offering such services.

Reputable Mobile Phone IMEI Unlocking Service Providers: