Iphone 4s activation problem?

Hi
i have iphone 4s iOS 6.1.3 and it is unlocked. But when i restored it i'm stuck in activation process and iTunes showing me this message
The SIM card inserted in this iPhone does not appear to be supported. The SIM card that you currently have installed in this iPhone is from a carrier 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 carrier or request that this iPhone be unlocked by your carrier. Please contact Apple for more information.

please help how to activate now.

Added (1). It is neither jailbroken nor stolen/lost. But still problem

Contact apple, only they know what is up.

If this is factory unlocked by Apple (bought unlocked from Apple ONLY), then call apple to fix this issue

if this is a locked Iphone, and either unloced by device code from wireless carrier or by jailbreak hack, then itunes restorals and activations always removes that unlock… You will need to rejailbreak it and unlock it via hack app… Then activate it with your sim

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