Every way to add credit to an O2 Pay As You Go SIM: online, in the My O2 app, by retail voucher, by debit card on 4444, by auto top-up and how to buy a Bolt On from existing credit.
UK host network
Six methods
All six methods are free to use, all credit your SIM in under 60 seconds.
Best for
A desktop or laptop and a saved card.
Best for
Day-to-day top-ups with a saved card.
Best for
Cash users, prepaid-only households or gifting a top-up.
Best for
No smartphone or app access.
Best for
A Pay-Monthly-like experience without the contract.
Best for
Already have credit, want to convert it into a 30-day allowance.
FAQ
The minimum O2 top-up is £10 online, in the My O2 app, by retail voucher and over the phone on 4444. Top-ups go up in £5 increments. Pay As You Go bolt-ons typically cost £10, £15, £20 or £30 depending on data, minutes and allowance.
Card top-ups online, in the app and by phone are credited within 60 seconds of payment confirmation. Voucher redemptions land as soon as you enter the 16-digit code. Auto top-up triggers fire within a couple of minutes.
Yes. Sign in to o2.co.uk or open the My O2 app from any device anywhere in the world. You can also call 4444 over Wi-Fi calling. O2’s site, app and phone systems accept top-ups from anywhere, the credit lands on your UK SIM immediately.
Three free options. (1) Dial *#1345# from your O2 SIM for a free balance pop-up. (2) Text BAL to 4444. (3) Sign in to My O2 (web or app) and the dashboard shows credit, any active bolt-ons and their expiry date.
Sign in to My O2 → Top up → Auto top-up → click Cancel. Your saved card is removed and no further automatic charges happen. You can still top up manually any time.
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