Keep using your old sim until it switches off. Once this happens put your o2 sim in your phone and reboot it every half hour until you get a signal on it.
After the initial connection it can take up to 24 hours for all services to come online, so you may only be able to receive calls and texts but not send at first etc.
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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