O2 is a leading European network operator and part of the Telefónica group. O2 has 37 million customers across Europe and is the fastest growing operator in the UK. O2's online channel has more than one million online customers, making it the leading online channel for mobile in Europe.

O2 Free sim Tariffs:

1) Text and Web - 500 texts and unlimited internet, when you top up just £15 a month. If you’re more of a texter, top up £10 a month to get 300 texts.

2) O2 Text and Call - 100 free mins and 100 free texts to any UK network and landline, when you top up £15 a month.

3) O2 Unlimited - Unlimited UK calls and texts to anyone on O2, when you top up £15 a month.

4) O2 Your Country - An extra 100 free minutes of international calls to almost any country, from Poland to Pakistan, Bulgaria to Bangladesh. That’s on top of your credit, when you top up £15 a month. And texts to the rest of the world are just 10p each.

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