Originally Posted by egale
Which carrier? In any case, all of the OSs are written by RIM. Each individual carrier has their own version though and newer versions of the RIM BB OS fix some bugs and give you some new themes.
The main bug that is fixed is the ring volume being too soft if you have used the speaker phone. A search of the forums will give you more info on the new themes Today & Zen.
Some people upgrade with no problems and see improvements in phone quality and others have problems and have to revert back!
Whatever OS is on your phone is the most current for that carrier.
Thank you for the details. For the record, I am on Cing. network.