I want to carrier unlock

Please see: How to unlock your iPhone for use with a different carrier - Apple Support

It sounds like you were using an "old" carrier previously with your phone and have switched to another "new" carrier. Is that correct?

If yes, the first order of business is to contact your "old" carrier and ask them to confirm that your phone has been "unlocked" from your "old" carrier's service.

Then, you can contact your "new" carrier and ask them for assistance in setting up your phone to work with your "new" carrier's service. Your phone will be locked to the "new" carrier at this time.