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What is a SIM-Lock?

Nov 1st 2020, 12:18 pm
Posted by brockdupon
SIM lock:

A simlock, NETWORK LOCK, carrier lock, imei lock or (Master) subsidy lock is actually a technical constraint built into GSM and CDMA phones by manufacturers to be used by providers to limit using these phones to particular countries and/or networks. This is as opposed to a phone (retrospectively called SIM-free or unlocked) that doesn't enforce any SIM restrictions.Unlocking a smartphone is practically universally legal. Also, it is often legal for service providers to force SIM locks for certain amounts of time, differing by area.

Unlocking Technology:

Typically, a locked device will show a message if a restricted SIM is used, asking for the unlock code. On new phone models working on Android os software, the cellphone should show a message saying "SIM network unlock PIN" or "Enter Network Lock Control Key" if it is network locked. Windows phones are going to display the message, "This SIM card can only be used on specific networks. Contact your customer service center for the unlock code". Some other handsets may display assorted messages for example , "Enter special code" or "Enter unlocking code," or sometimes the device will probably display a message stating it's locked. When a valid code is keyed in, the device displays "Network unlocked" or "Network unlock successful".


Mobile providers have commercial incentives both to strengthen SIM lock protection (which placates service companies and will allow exclusivity offers) as well as to weaken it (widening a handset's allure to consumers that aren't interested in the provider that offers it). Additionally, making it very hard to unlock a smartphone might make it less desirable to network service providers who have a legal responsibility to supply unlock codes for certain handsets or in selected countries.

Unlocking Services:

Quite a few organizations offer a network unlocking service. This service needs individuals that want to unlock a handset to give their IMEI number to a service supplier and sometimes they will also request the country and cellular network the phone is locked to, sometimes sent through email or submitted on their web-site. The company will then provide (for a fee) a unlock code for the mobile. For a few brands including Nokia and Samsung various services additionally supply unique remote-unlocking software with guidance, when a cable is needed to remove the SIM lock at home. Such companies may email the unlocking code or software which will remotely unlock the unit. The cost for unlocking a mobile phone may vary dependent upon the mobile phone network it is locked to and the device model itself, as every unlock code is unique to each specific handset.

Unlocking Service Providers:

Unfortunately there are a massive number of fraudulent sellers working in the smart phone unlocking industry. Consequently it is recommended to be sure you locate a genuine service provider for these services. Take the necessary precautions and investigate every potential suppliers before committing to place an order. In the case of online providers, make sure they list their genuine business name and associated registration information (all genuine organization should be lawfully registered with all the official authorities within their country of origin) and make sure they provide a legitimate certified address and contact information on their web site. In addition make sure that any payments made are thru legitimate sources such as a recognized bank or financial institution using a debt or credit card, but never make payment via a direct transfer since this offers no fiancial safety. To assist with a search for a reputable supplier, we have supplied an inventory below (and in no particular order) of several legitimate organizations currently offering such services.

Reputable Mobile Phone IMEI Unlocking Service Providers: