Is it possible to unblock a blocked SGS II ?

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Hi ,

I have a question some one on ebay has a samsung galaxy s II which is is perfect condition, it can see mobile networks according to him but he says he cannot connect to to any network because his Insurance/carrier blocked the phone

could this be just the simple network block or could it be some sort of IMEI block ? any idea ? also is there a way of unblocking it anyways ?

Talk about insurance fraud, stolen phones and any possibility of making them work is forbidden on XDA as doing such things carries lengthy jail terms in most countries.

cool