I bought an unlocked Samsung Galaxy SIII on Amazon and transfered the O2 Sim from my old 'phone. I am connected to Wi-Fi at home and I do not want to use O2 except on 'phone calls and text. The Sim is pay-as-you go. But, O2 are taking £1 every day and giving me 50MB, which I don't need because I use Wi-Fi connected to my ISP.
How do I disable the 'phone from using the Sim unless I am making a 'phone call or sending a text? I suspect that the 'phone connects automatically to O2 when the Wi-Fi is turned off, which I do to save power, but I am not sure.
Many thanks,
Alex
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