Iphone 4 says no service is it blocked?

I was on a 24 month contract with 02. I payed it all didn't miss a payment. They asked if I wanna do antoher 24 month I said no now my phone says no service and no sim cards work. Why is this and is it blocked?

Take the phone and old contract details into the nearest 02 shop, they will come up with the answer.

If you decided not to renew the contract, then the phone won't have any service once the 24 months have expired. So what you could do either take out another contract with the same phone and SIM, or get an O2 PAYG SIM and put that in your phone.

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