Ive got a BB Bold 9900 as well, has anyone manage to tether with that?
It's a bit picky with hotspots. For instance, it works with my iPhone 4, but fails to work with my iPad 1. It's either because the latter only supports WEP encryption, or the hotspot needs to be of the infrastructure type, not peer-to-peer.
ive set up joikuspot successfully but the vita doesnt recoignise it. If i try bluetooth then it picks up the bluetooth signal but then fails to connect to the phone!