Verification after restoring phone.

How can I verify my phone after restoring it, when the sim is not from a supported service provider.

When the sim is inserted, I receive this message. "The SIM that you currently have installed in this iPhone is from a service provider that is not supported under the activation policy that is currently assigned by the activation server. This is not a hardware issue with the iPhone. Please insert another SIM card from a supported service provider or request that the iPhone be unblocked by your service provider. Please contact Apple for more information"