Depends on which model Curve™ you have…
– 8300 series – Wifi support on select models.
– 8500 series – Wifi enabled
– 8900 series – Wifi support
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For me, on a Curve 8310 (no Wifi), I find that the builtin Blackberry Browser is poorly supported by the Fluther site. I cannot, for example, actually login. Same is true for the Opera Mini.
Personally, I consider it more a shortcoming of the device/browser than of Fluther. That said, there are plenty of other sites I can sign in to just fine. Still, web surfing on the 8310 is painful even on the best of days.