My office issues blackberry out for employees and it allows us to tether to them. I do have a personal iPhone and everything is fine there, but I do have to do work and bandwidth is an issue at that point....so I need to use the companies bandwidth. Since the second beta I can no longer tether. Bluetooth is NOT enabled on the BBerry due to over zealous security policies, so I can only tether by USB. The settings work still as I can tether on a Mac at home that is still on Maverick. I think it is the Mac it self, as I said tethering works as normal on a non upgraded Mac, AND the Mac I have Yosemite on no longer automatically recognizes the Blackberry. Desktop Manager does not open as it used to but once I manually open the app it will connect to the phone, as well as backup, but none of this is automatic. I am using a late 2010 MBA.