Help me plz to ipdate ios

sajidch
sajidch Posts: 4
edited October 2013 in iPhone Forum
Friends i have iphone 4s factory locked.and i use gavy sim and now my os v is 6.... And i want to update 7.this os update can any cause on my sim network.bcoz i heard if i update ios 7 then i loss my iphone network..is this true??? Reply plZimage

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