Yes, but it will only be free to change at the end of your contract.
If not at end, you will have to pay a termination free.
Call CS on 202 and they will do it for you and send you a new PAYG sim card.
I have no affiliation whatsoever with O2 or any subsidiary companies. Comments posted are entirely of my own opinion. This is not Customer Service so we are unable to help with account specific issues.
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