Is it safe to provide IMEI to carrier for unlocking iphone?

Hey guys i borrowed iphone from an unknown dealer online and i don't have any information about them. Now i want to unlock my iphone to use it on any carrier.
Is it safe to provide them my imei? I'm using gevey till date and worried that they will stop this trick i tell them my imei,
Also if they agree to unlock, should i pay them?

If you are an AT&T customer, AT&T will unlock it for you as long as it is not under a contract. If you are not an AT&T customer, find a friend that is and have them call AT&T and tell them it is there phone that they bought and they will unlock it for them. It is a simple process. All they will do is give you a code that you will enter when you put the other carriers sim card in the phone when it prompts you.AT&T will allow its customers to unlock up to 5 phones per year.

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