Unlocking my old iPhone I no longer have.

Hello. Last December I gave my old iPhone X to my brother in law as a gift. He lives in the Philippines and unfortunately I didn’t get to unlock it before giving it away as a present. Can I still unlock it remotely if I have my old phone’s IMEI number? And which IMEI number should I use - the physical SIM, the digital SIM or the IMEI number that’s found on the back of the phone box? Thanks in advance.