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Two days back i downloaded OS 3.0 to my apple iphone 3G through my apple Macpro laptop.After completion of downloading,i saw that the iphone was locked showing a Wire/Plug with itunes emblem on the iphone screen with a message stating that "Only Comapatible SIM card from a supported carrier may be used to activate iphone".Now i am unable to open the iphone.The iphone 3G was bought by me during February 09 from an authoried shop in an unlocked condition and i was using the same with any SIM card.In USA i was using the phone with AT&T SIM card and after i downloaded 2.2.1, the carrier was disabled and i was advised to use the SIM card from the supported carrier which i found out to be O2 of UK.Then i unlocked the same through an unlockable SIM and was again using AT&T SIM card.Recently I was using AIRTEL SIM card.Few days back when I downloaded OS 3.0,it got locked and i am unable to open the iphone.After downloading I noted ICCID number was also chenged. Please guide me.