O2 unlimited data sim only deals

O2's unlimited plans give you uncapped data with full 5G speeds where available, so there's no monthly allowance to track.

A fair usage policy applies to prevent commercial-scale or non-personal use, but typical heavy users streaming, gaming and tethering are very unlikely to hit it.

Yes. O2 offers unlimited data SIMs across rolling 30-day, 12-month and 24-month terms, so you can choose flexibility or a lower monthly price.

A 30-day unlimited plan is great for trying out heavy data use, while a longer contract usually costs less each month if you're committed to O2.