"We'll give you up to 2 free SIMs, each with unlimited O2 to O2 free calls and texts when you top up just £15 a month. That's unlimited texts to invite everyone over, unlimited calls to arrange nights out and unlimited ways to connect your mates together, for free."

Is my phone compatible with an O2 pay as you go SIM card?
Your phone will be compatible if it is a GSM (digital) phone currently connected to O2 or Vodafone, or if it is a dual-band or triband phone currently connected to T-Mobile or Orange. You may be able to unlock your phone for any network.

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Tariff details can be found here