Two things you may want to do:
Re-register on the Blackberry Network:
Settings>Options>Advanced Options>Host Routing Table>highlight any entry>menu key>Register Now.
Or, you may need to switch the default browser from whatever its current selection is. It may be stuck on Wi-Fi browser.
Settings>Options>Advanced Options>Browser or Default Services. I forget which it is on 4.5.
Pulling the battery is never a bad idea either.
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