PROTO TYPE MOBILE MOBILE PROBLEM

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HI !

I AM FROM SWEDEN.I GOT MOBILE FROM ONLINE BID SALES,HE SOLD ME MOBILE WHICH IS ACTUALLY PROTOTYPE MOBILE.THE NETWORK PROVIDER CHARGING A LOT WITHOUT ANY REASON .AS I ENQUIRED THEM ABOUT THIS PROBLEM,THEY SAID I AM SENDING MESSAGES WHICH COSTS A LOT ,DUE TO THAT I HAVE BEEN CHARGED.I USED TO GET TO MESSAGES FROM SOME SWEDEN NUMBERSTATES THAT "YOU ARE USING PROTOTYPR MOBILE,PROPERTY OF SONY ERICSSON.PLEASE UPGRADE TO NEWER SOFTWARE".I CHECKED MY MESSAGE SETTINGS IN MY MOBILE,NOTHINGIS WRONG THERE.PLEASE LET ME KNOW THE SOLUTION,IF ANYBODY KNOWS.