I just updated my iphone 4s to ios 6.1.3 and then a message came up saying 'sim failure' and it said 'invalid sim' where my carrier name should have been at the top. I turned it off and on again to try to fix this but now it just says searching where my carriers name should be.Now it wont let me send texts or phone anyone because it says my number is unknown.
Does anyone know how to fix this without having to get a new sim card?
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