good day, i have a problem that i need an answer to. a friend of mine updated my iphone 4s software to ios 9, but now it doesnt want to accept my sim card… i tried reinstalling and restoring it om itunes but it still doesnt work. please help

good day, i have a problem that i need an answer to. a friend of mine updated my iphone 4s software to ios 9, but now it doesnt want to accept my sim card… i tried reinstalling and restoring it...
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