Just a heads up, new blackberry update was released today, adds a nice new feature wifi calling 
Just done it on mine and works fine crystal clear.
http://www.tmonews.com/2012/03/wi-fi-calling-comes-to-blackberry-9900-9810-with-new-software-update/
Just done it on mine and works fine crystal clear.http://www.tmonews.com/2012/03/wi-fi-calling-comes-to-blackberry-9900-9810-with-new-software-update/