@Silvester
You just top up a PAYG sim to activate it Guide How to Top Up (PAYG)
If you have your old sim you can do a sim swap yourself Guide: Sim Swap: a mini guide 2017 update
If not, call 4445 once you have activated the new sim.
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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