Can I change my iPhone 3G's sim card?

RichB17

New member
I'm the owner of an iPhone 3G and I am currently using the o2 network in the UK (as o2 had exculsive network rights at the time I bought the iPhone) however I want to change to the Orange network because where I live there is better 3G coverage where I live. Can I just buy an Orange pay & go sim card and switch it with the o2 one currently in my iPhone?
 
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