Replaced iphone 4s but apple didn't inform carrier. Now unable to unlock that device since IMEI is not the one associated with my account. How do I get phone unlocked?

iphone 4s replaced under warranty. Carrier (O2 Uk) not informed by Apple or me of this. I have updatesd to 5C but gave 4S to son. Trying to get 4S unlocked to use SIM only contract but O2 won't / can't unlock since the IMEI now doesn't match the one they have on file for my original 4S at start of contract.
Can anyone help?
Cheers

Call AppleCare & they can fix this for you, or go back to the Apple store that replaced your phone. No one here can help you.

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