Instead of going to "browser configuration" in browser options go to "general properties" and change the "default browser" to the one you wish to use. Changing the browser in browser configuration does nothing. It must be changed in general properties. You can, however, change the browser identification in browser properties and that does work.
Im having the same problem as this, when i try to change browser, the only setting i get is a hotspot. I bought mines on o2 from a friend, im on a sim only tariff with unlimited data.
Do i need a blackberry plan for this to work or is there a way around it?