What is a carrierlock

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SIM lock:

A SIM-LOCK, NETWORK LOCK, Carrier Lock, imei-lock or (MASTER) subsidy lock serves as a technical constraint built into CDMA and GSM cellular phones by producers for use by carrier networks to restrict the use of these phones to a particular countries and/or networks. This is in contrast to a phone (retrospectively called SIM-free or unlocked) which doesn't impose any SIM restrictions.If the phones had not been locked, users may well sign an agreement with a particular company, get the discounted phone, then quit paying the monthly payment (thus breaking the agreement) and begin using the mobile phone on a different network or maybe sell the device for a profit. SIM locking reduces this by barring a change of service (using a new SIM).

Unlocking Technology:

A phone can be unlocked simply by entering a code supplied by the service operator. Alternative mechanisms include software operating on the handset or a pc connected to the device, hardware devices that attach to the handset or over-the-air by the provider. More often than not the unlock process is permanent. The code required to remove all locks from a smartphone is known as the master code, network code key, or multi-lock code. If the handset is network locked it will generally display one of the following messages: SIM network PIN blocked, Enter lock PIN.

Economics:

Most of the time a SIM-locked smartphone is offered for sale at a significantly lower cost than an unlocked one simply because the company expects income thru its service. SIM locks are used on less expensive (pay-as-you-go) mobiles, though bargains on higher end handsets demand a subscription that provides guaranteed income. Unlocked mobile phones have a greater market value.

Unlocking Services:

unlock my phone myself
Many companies offer a online phone unlocking service . This service needs people that would like to unlock a phone to give their IMEI number to a unlocking company and often they will also request the country and network the device is locked to, frequently sent through email or submitted on their web-site. The supplier will then supply (at a cost to you) a unlock code for the handset.

Unlocking Service Providers:

Disappointingly there are many of scammers sellers working in the mobile phone imei unlocking industry. Consequently it pays to make sure you find a reliable provider for these services. To aid with the search for a trustworthy supplier, we have provided a listing just below (and in no particular order) of a number of legitimate organizations currently offering such services.

Reputable Mobile Phone IMEI Unlocking Service Providers: