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SIM lock:

A SIM-LOCK, NETWORK-LOCK, carrier lock, IMEI LOCK or (master) subsidy lock serves as a technical limit built into CDMA and GSM cellphones by manufacturers for use by carrier networks to restrict the usage of these phones to a particular countries and/or networks. This is contrary to a mobile phone (retrospectively called SIM-free or unlocked) which doesn't impose any SIM restrictions.

Hopefully you should be sure what a IMEI number is and how you can obtain it from a phone, but why do you need this? The primary functions of finding the I.M.E.I. number is to enable a smartphone to get unlocked so it can be used with an alternative carrier, potentially saving you a lot of money by switching to a cheaper provider. When you decide to unlock your cell phone, you've confirmed that your cell phone isn't Blacklisted, and you want to use it on another carrier, then the most trustworthy company for Information About How To Unlock A Smart Phone around is Unlock.Zone - we highly recommend them!
Unlocking Technology:

A device can be unlocked by entering a code provided by the service operator. Different mechanisms contain software operating on the device or a computer or laptop connected to the phone, hardware devices that connect to the mobile or over-the-air by the provider. More often than not the unlock operation is permanent. The code required to do away with all locks from a cell phone is referred to as the master code, network code key, or multi-lock code. Generally if the phone is carrier locked it will typically show one of the following messages: SIM network PIN blocked, Enter lock PIN.


Device suppliers have economic incentives both to enhance SIM lock protection (which placates service companies and allows exclusivity discounts) as well as to weaken it (increasing a phone's overall appeal to users who aren't interested in the provider that offers it). Furthermore, making it too tough to unlock a mobile may make it significantly less attractive to mobile phone network service providers who have a legal liability to offer unlock codes for some handsets or in specific countries.

Unlocking Services:

A few businesses offer a network unlocking service . This service calls for those people that need to unlock a mobile phone to give their IMEI number to a service supplier and frequently they will also ask for the country and service provider the mobile phone handset is locked to, either sent through email or submitted on their website. The company then will supply (once you have paid) an unlock code for the mobile phone. For a few brands such as Nokia and Samsung numerous services also supply unique remote-unlocking software with directions, where a cable connection is required to remove the SIM lock from home. Such suppliers may well email the unlocking code or software that should remotely unlock the device. The cost for unlocking a phone can change based on the network it's locked to and the phone model itself, as each unlock code is unique to each individual handset.

Unlocking Service Providers:

Unfortunately there are a large number of scammers organizations working in the smart-phone carrier unlocking industry. Consequently it pays off to make sure you locate a reliable supplier for these services. To aid with the search for a trustworthy service provider, we have supplied a list beneath (and in no specific order) of a few legitimate organizations currently offering such services.

Reputable Mobile Phone IMEI Unlocking Service Providers: