How do I remove my number from a family member’s iPhone using AT&T upgrade?

Update Contact will indicate and use a default phone number that will use the correct (chosen) eSim to make a call. It is irrelevant if you only have one sim installed as it will only use the active sim as a default.

Since you upgraded "your" number, it got transferred to the new phone. You will need to contact ATT as they are the ones that provision the phone and remove the locks once it is paid. They will aid in installing your daughters eSim and number to her phone. Apple has nothing to do with this.

Stop into an AT&T corporate store, not an Authorized Reseller Store and explain the situation. They’ll be able to affect the changes to your devices and plan. I know because I had to do it with my son’s iPhone and mine several months ago.

Apple does not lock the eSIM, it’s an activation lock on Apple iPhones that are financed through Apple. A eSIM lock and activation lock are two entirely different things.

If you financed the iPhone through a carrier upgrade plan, Apple did not have an activation lock. Apple cannot lock or unlock SIM cards. The carrier is controlling both the activation and SIM. You must deal with AT&T to resolve this issue.

I suggested in the very first response that you go to an AT&T corporate store and resolve the issue. You should be in and out in 15 minutes if you make an appointment. You need positive ID and the 4 digit passcode to your account.

That has nothing to do with Apple. You would have to ask AT&T about that. If you signed a contract with them for the phone update, you may have missed someting in the contract that you signed.

I am no longer either AT&T and now I used TMobile service

Do you have a specific question?