HOW TO ACTIVATE MY INTERNET AND SOCIAL NETWORKS ON MY BB CURVE 8520

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SIR,I HAVE A SMALLER EDGE SERVICE.MY BLACKBERRY CURVE 8520 HAS REFUSED ME ACCESS TO INTERNET.ANYTIME I TRY TO SURF MY INTERNET,IT TELLS ME ''UNABLE TO CONNECT TO INTERNET ,TRY AGAIN LATER.''OR THAT I SHOULD CONTACT MY SERVICE PROVIDER.WHICH TO BE FRANK I DON'T KNOW.PLEASE I KNOW YOU WILL HELP ME OUT .THANKS