How does iPhone Factory Unlock work?

Can anybody here please tell me how iPhone factory unlock works? I mean third party unlock service providers just ask for name and IMEI number and provide unlocking service in a few days. How do they do that? I mean how do they put that in Apple database? I would appreciate your help.

It removes the network lock (Service Provider lock), and makes the I-phone as sim free Phone… If you going to get Unlock service from service provider you need to provide the details IMEI, Model to them. If you going to get the service from Online sites, You need to specify brand, Model, Imei number, Network and Country its locked now. Then only they send unlock code or give unlock service to unlock your i-phone. If service provider will give code, they get the code from their network database.
I would suggest the remote unlock service to unlock i-phone.Visit the site http://www.mobile-unlocker.com/apple-iphone/rs2wp9/ get Remote unlock service and unlock i-phone easily.

Only the service provider can factory unlock it.

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