[Richard427]

I have a 9780 which has superior wifi call quality (without wifi, I would barely be able to use the phone), and being UMA , it seamlessly goes to 3g when I leave the house. I understand that the 9900 would likely drop the wifi call when it leaves the wifi range, but how is the call quality within the range? Much thanks !!!!

[BlazorBoy]

You will probably be very disappointed with wifi calling. Mine works only sometime even with a very strong wifi signal. My 9700 worked flawlessly with the same signal and all over the world.