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after updating my iphone to ios6,its not says "sim card not valid"...what should i do to if i want to restore it back to ios 4?

220 Views 1 Reply Latest reply: Feb 1, 2013 3:36 AM by diesel vdub RSS
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Jan 31, 2013 9:06 PM

I was updating my iphone to ios6...when update completed it says "SIM Not Valid" phone is not just shows message that sim not valid...what should i do to activate my phone?Does restoring it back to ios 4 will help?if it helps then how to do it?

iPhone 4, iOS 4


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