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Hi there, @Carroll83
Thanks for your question!
Generally speaking, the phones locked to the network are our prepaid handsets. As you mentioned this device was previously on a post paid plan, it should be an unlocked handset.
That said, some earlier model iPhones sometimes need an unlock process followed in order to be used with a different network SIM.
Our How to Unlock Your Prepaid Mobile Phone or Device page will give you some extra details, should you need it.
I know this was a postpaid phone, but the page will assist should you need to double check any details.
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