Pay as you go iPhone on o2, internet usage?

How does internet usage work on a pay as you go iPhone? Say if I wanted to connect to my Wi-Fi network at home on my iPhone, will it cost me money? What about if I connect to the internet not using Wi-Fi? How much of my credit will it take?

You can check in Network usage settings

Using Wi-fi is free, it won't take anything from your credit. If you connect to the internet without using Wi-Fi it depends on how many MB or GB you use as to whether you'll be charged. But usually it doesn't take any, i'm on O2 also.

Agree with Daniel: doesn't cost me any thing because I keep the Data button off all time.

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