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"No Service" after 4.2.1 update on Iphone4

grand_archon

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Hi guys.I updated my recently bought I4 last night to iOS 4.2.1. I bought this from UK. The phone with the sim I was using was operating perfectly. After updating, the signal was gone and "No service" is shown on the phone. itunes indicates "the sim card inserted in this phone does not appear to be supported". i inserted the same sim card on my sony ericssson phone and it is functioning fine. Why does my I4 indicate "no service"? What should I do? Thanks
 

iGaz

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Did you buy your phone from a shop, second hand (ebay)?

Was your phone unlocked before you updated? If so then you've lost your unlock and that will be why your sim is not recognised. If not then do a restore in iTunes to see if that solves it...
 

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