good day all, form i bought my f900 unit am having problem make call on it, bt connect well, ph book copied but when its time to make or receive calls i cant hear nothing the unit just go in silent mood, i update the bt its the same thing, check connections everything connect properly. can any1 asset me???

I know you won't hear a ring, the bt only gives you sound when there is a connection. So try to make a connection and adjust the volume.