Love your mobile? Hate your tariff? Then keep your mobile and get yourself a new tariff with an O2 pay monthly sim card. The same great value monthly package of minutes and messages as you would with a full 12/18 month contract.Whether you prefer chatting or texting there are 10 tariffs to choose from you will definitely get one to suit your needs.So keep the phone you love and stick to what you know but get the great value for money of a contract every month.The O2 pay monthly sim card is designed to give you the flexibility of more minutes and texts each month than on pay as you go set ups. Just simply put the card in your existing phone then chat and text away!