How can I unlock my carrier ? I got this phone from a friend .

To be able to use any SIM across the globe you must have "No SIM Restriction" against Network Provider Lock. Please refer to the pic below.

Carrier Lock:- Request your iPhone’s original Carrier to unlock your iPhone and if they agree and do it, then you may know the further process here --> How to unlock your iPhone for use with a different carrier ...

Device Unlocking Policies | Verizon Privacy Policy

Unlock a Phone or Device - AT&T Device Unlock Portal

Unlocking your Sprint device - T-Mobile

FAQs about unlocking your Sprint device

Unlock Your Phone for Spectrum Mobile

Nope. Your friend is the only one who can do that. Phones locked to a carrier are usually ones that were part of a promotion or contract deal. Your fiend will have to call the carrier and request the unlock. And if she gave it to you without preparing it for sale or donation you will not be able to use your own Apple ID or personal data either.