Ever since OS 7.1 was loaded on to my Bold 9930, it has had numerous times where it would randomly,
#1: Not make a sound for any incoming call or text.
And #2: Will not transmit any voice over the cell. This is either from me or the other party.
The only soultion has been to remove the battery and reboot the cell. Sprint has even replaced the cell for me after their techs could find no reason why the cell stopped working properly.