Iphone 5 does not recognise sim card?

I bought an unlocked iphone 5 in the uk from the carphone warehouse

I then got a orange sim card pay as you go and got that running. However inside my house the signal wasn't good enough so I decided to buy a Vodafone sim card

I have put the Vodafone simcard inside the phone and the phone is picking up a 3g signal but it doesn't appear able to activate it via the cellular way. I don't have Wi-Fi at home and when I try hooking up the phone to iTunes it says my simcard appears unsupported.

Can anyone help? The official apple website seems pretty useless at explaining the problem.

The first sim you put into the phone is the network it gets locked to, so now you need to unlock it again, carphone warehouse always do that.

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