I have iphone 4s from japan which is a carrier locked (kddi ) it has ios 5.1.1 and now i want to upgrade to ios 6.Can i do the software update or it will cause any harm???

i have iphone 4s from japan which is a carrier locked (kddi ) it has ios 5.1.1 and now i want to upgrade to ios 6.Can i do the software update or it will cause any harm???

If you have a Japanese iPhone and are using it with any carrier other than Softbank or AU, then it was hacked, since as the others have said neither of those carriers unlock iPhones. Therefore if you upgrade iOS or restore your iPhone, it will lock back to the original carrier and be unusuable with your current cell provider.
We cannot help you with jailbroken iPhones. You'll have to look elsewhere for further assistance.
Regards.

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