SIM NOT SUPPORTED

SIR I HAVE AN IPHONE 5 AND MY ISSUE IS FIRSTLY WHEN I WAS USING IPHONE MY CARRIER WAS UNLOCK AND I INSERT ANY TYPE OF SIM IT WORK BUT NOW I HAVE INSTALLED A NEW SOFTWARE FROM ITUNES BUT NOW I HAVE FACE THIS ERROR THAT ANY SIM I INSERT IN IT NOT WORK AND SHOWS SIM NOT SUPPORTED YOUR IPHONE IS LOCK TO A SPECIFIC CARRIER IT MEANS MY IPHONE CARRIER IS LOCKED SO KINDLY SIR UNLOCK MY CARRIER I WILL BE VERY THANKFUL TO YOU FOR THIS FAVOUUR.(SIR I AM FROM PAKISTAN AND THIS IPHONE WAS BOUGHT FROM JAPAN BY MY UNCLE AND IT IS PTA PROVED THANKS!)

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