@Luigi
Your best bet is a classic PAYG sim from either Tesco or giffgaff.
These only require a top up once every 6 months, unlike al O2 PAYG sims which need topping up monthly.
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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