I have a Blackberry Pearl, and I try going on ROBLOX, but it's hard. T.T
ROBLOX should have a little thing for mobile phones where you can post on the forums, check your PMs, send and recieve friend requests, and maybe even view your profile!
If your fingers are to big, you don't buy the blackberry in the first place. Also you can already surf the site with it I think. And they arn't gonna make games playable on it.