@Koko
Both Tesco and giffgaff still do standard PAYG and run on the O2 network.
If you want to switch, you need to get your PAC from O2 Guide: How to get your PAC [June 2021 Update] to give to either to keep your number.
https://www.giffgaff.com/
https://www.tescomobile.com/pay-as-you-go-sims
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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