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You can calibrate the phone again.
Start calibration again and put phone on a flat surface. Follow the on screen instructions.
Or you can reset the phone to its default settings but it will remove your data from phoe so take a backup before doing the reset.
Go to settings, SD and Phone storage, factory data reset
While you're in the call, use the volume buttons on the right hand side of the Tour to turn up the volume.
If you still can't hear, you might want to try using the speakerphone -- it's louder. The speakerphone button is the same as the dollar sign ($) button, just press it during a call to activate the speakerphone.
If the volume button makes your outgoing call sound better, but then the next time you make a call the volume drops again, go into the phone's sound settings (Home folder > Options folder > Phone Options > General Options) and under Default Call Volume, change it to a higher number, or to Previous.