It could help to know your carrier because most block the service books for WiFi and prevent it's use without the correct plan. Chances are as NJBlackBerry asked about the BB data plan, you dont have one.
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I have a Blackberry 8520 and three days ago it stopped connecting to the internet returning "unknown host" message. I contacted o2 who are my carrier and they have advised there is no problem with my data plan and as far as they can tell all my services are fully functional .. however they did advise of a BB outage over the past weekend. Does anyone have any idea as to whether the outage has been fully restored or what the problem could be with my BB ?