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O2 SIM-only deal

O2 SIM card

3GB data (5G)

Unlimited minutes · Unlimited texts

SIM Only Ultimate 3GB · Sold by O2

£24.99 a month

£0.00 upfront · 24-month contract

Rises to £27.49 from 1 Apr 2027

Rises to £29.99 from 1 Apr 2028

£659.76 estimated minimum-term cost (listed rises included)

Estimate for a contract starting around the latest refresh date. Includes upfront payments, introductory discounts and listed rises over the minimum term. Cashback is not deducted. This is not a retailer billing quote.

View at O2

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Included extras

Terms and price rises

Monthly Airtime Plan will increase from April 2027 Bill by £2.50 (SIMO/Handsets).

Check coverage, fair-use and roaming allowances, renewal and cancellation terms, and eligibility before applying.

Last checked 20 Oct 2026, 13:09. Retailer feed updated 12 Oct 2026, 07:17.

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