@Moz1
If you have taken a new contract you will need to migrate your number Guide: Migration & porting into O2
A sim swap will put your old tariff to a new contract which will result in cancellation of the new contract and full costs will need to be paid.
If it's just a simple new sim on an old contract then a sim swap is fine.
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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