Home Why my iphone pay as you go sim is not working in second hand iphone?

Why my iphone pay as you go sim is not working in second hand iphone?

I have bought a second hand iphone 3 and which did have an o2 sim. I have tried it many time but facing the same problem. Tell me that do I need to change any setting in my phone to make this sim work in it? Or should I talk to the customer care of iphone pay as you go sim plan?

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