Treo650 - phone problem

[man64]

Hai please help..
I'm using my Treo650 for 2 years & now i had problem with my Treo where i'm cannot make a call(can make call but can't here the tone).. I tried to do hard reset but the problem still the problem..
If anybody have any idea please help.. Now i'm using my old Nokia..:confused:

[man64]

Add..
To share with others..
My favourite utility software to run on my Treo..
a. Agendus
b. Bonsai - most powerful
c. msmoney
d. shoppers
e. bejewel2
f. Zlauncher
g. Kinoma - movie/video clip
h. Ringo Pro