MT4 has a Mobile version I was looking to purchase because it is less than $50 and would be handy to have as I am commuting, et al. BUT, the question has specifically been asked if they will do a platform for Blackberry, and they have said no...twice.
So, I was originally looking for a phone, but now, I think I will just get a Blackberry and if I get to the point I need the mobile MT4 version, I will buy a PDA...bigger screen and better for those kinds of apps.