New customers only. 24-month min term sim only tariff purchased directly from O2. Price applies until you change tariff, leave or upgrade. Unused mins, text and data allowances must be used within the month and cannot be carried over. Offer may be withdrawn at any time. Unlimited data available on selected devices and selected SIM Only tariffs. Fair use policy applies, personal and non-commercial usage only. Europe Zone roaming capped at 25GB per month, data Bolt On required if limit is reached. Phone not included. 18+. Subject to status, availability and payment by direct debit. Terms and fair usage policy apply, see o2.co.uk/terms.