In an ideal world, the vendors should have fully-capable emulators available for free download and evaluation by web developers, so their products will actually be useful to the public.
It appears to have a simulator in the device's SDK: http://developer.danger.com/site/faq/show#q28 http://developer.danger.com/site/docs/quicksim http://developer.danger.com/site/simulator
However it sounds convoluted to set up, you seem to need to request a special account (and to already own one of these devices) to use it, there's no guarantee that the simulator actually includes the device's web browser, and you may have to agree to an EULA that involves signing over your first-born child.
In short, I'd hold out for an actual physical phone if I were you! ;-)
All the best, Nick.