O2 Pay As You Go SIMs suit people who want to control what they spend each month without a contract. You top up with the minutes, texts and data you need, and you can change or cancel at any time. They come as either a physical plastic SIM or an eSIM, which makes them a practical second-phone or travel option.
Choosing between a plastic SIM and an eSIM
The SIM is available as either a physical plastic card or an eSIM. A plastic SIM is the simpler choice if you plan to move one card between handsets. An eSIM suits a phone that supports it and lets you add the line without waiting for a card to arrive. Check your device manual if you are unsure which SIM size or format fits.
Keeping your existing number
If you are moving from another network, ask your current provider for a PAC code and give it to O2, and your number moves across to the new Pay As You Go SIM. If you are switching from an O2 Pay Monthly line to Pay As You Go, you can contact O2 by phone to sort the transfer.
Using a Pay As You Go SIM for travel
Roaming is one of the strongest reasons to look at this range. O2 says its Rolling plan can include international minutes to over 42 countries, and that free EU roaming is available up to 25GB within its Europe Zone. Check the current allowance before you travel, as these terms can change.
Topping up and managing your line
You add credit through MyO2, or by calling O2. Once topped up, you can use your allowance until it runs out, which keeps spending predictable. If you want a fixed monthly bill with a longer commitment instead, the Pay Monthly SIM range is the alternative to compare against.
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The useful details
A few things worth knowing
Are there any O2 Freesim discount codes?+
We don't currently list a confirmed discount code. That doesn't mean the store has no promotions; check its website for current prices.
Can I keep my number when I switch to O2 Pay As You Go?+
Yes. From another network, ask your current provider for a PAC code and give it to O2, and your number transfers to the new SIM.
Can I use a Pay As You Go SIM with 5G?+
Yes, 5G is available on all O2 Pay As You Go plans, but you need a 5G-ready device to use it.
Who handles my order?+
You complete your purchase with the retailer. For order changes, delivery questions or a refund, contact the seller shown on your order confirmation. Vouchernaut publishes shopping guides and offers; we don't process your purchase.
