I recently updated my iphone 3gs IOS4 to IOS 6.3?

However when I put my o2 sim i get a signal but when I put my vodafone sim in it comes up no signal. And it is vodafone I want really to work.
Does anybody know what i need to do please

Is the phone locked to a specific network? Or maybe it is the sim's problem, try a new vodafone sim and see if it works.

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