How to unlock iPhones professionally and free/cheaply?

I run an iPhone repair business and I get lots of customers asking if I can unlock iPhones but I have to tell them no. Does anyone know how to do this without just paying another business to do it. How can I do it myself? Do I need software? Do I need to speak to the carrieror Apple? HOW?! I can't find anything on the internet! Someone please help me thank you!

There are no cheap ways of doing it. You've to invest some dough in it. If you need some references, mail me.

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