I’ve recently had the (mis)fortune to work on a mobile application which tried to support Blackberry versions lower than 4.6. This is not fun!
BlackBerry Device Software 6.0
BlackBerry Device Software 5.0
BlackBerry Device Software 4.6-5.0
BlackBerry Device Software 4.5 and Under
Seriously, I haven’t found where Blackberry specifies what is supported. That makes it fun to try and determine what will work. And, if you’re curious about the support for CSS, don’t worry: it’s just as bad. 2