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I have a Blackberry8310 bought in the U.S ,and i bring it back to my country;it work well for month and suddently itwent off network without any reasons and now it can't find any network. Does it happen to someone before,and what is the problem ?and the possible solution to this? thank you

I bought an unlocked AT&T blackberry curves 8310 in the us and and brang it back to my country Norway ,and the phones worked very well here,for months,and suddently the phone can't find any network availlable so now i can't use it anymore,does anyone know what could be the problem,and what is...