web browsing on blackberry 7520

is there anything other than one of the data services pack that i need to be able to get online i ordered the ultimate pack but the browser still says it is unable to connect to the internet this is a blackberry 7520 that i bought off of ebay and put my i710 sim card in

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you need the blackberry service and need to have your account provisioned for blackberry service.
SERVICE PLANS
SERVICE BLACKBERRY DEVICE MONTHLY ACCESS BLACKBERRY DATA DIRECT CONNECT (BLACKBERRY 7520 ONLY) CELLULAR

Email Only Plan - Unlimited ALL $49.99 Unlimited $0.20/Min $0.40/Min
Email Only Plan - 5MB ALL $39.99 5MB ($0.01/KB Overage) $0.20/Min $0.40/Min

Voice & Email Plan - Unlimited ALL $44.99 Unlimited Voice Plan Required

Voice & Email Plan - 5MB ALL $34.99 5MB ($0.01/KB Overage) Voice Plan Required

Voice & Application Plan - 5MB BlackBerry 7520 ONLY $24.99 5MB ($0.01/KB Overage) Voice Plan Required