Samsung SCH-A670
No 1-touch mute button???
Only way I've found to mute a call that's in progress is to press the left soft key, go into the menu, select in-use, then mute.. very bad design from a safety standpoint if you are driving your car.
Also, if using your phone while driving, please:
Ӣ Give full attention to driving--driving safety is your
first responsibility.
Ӣ Use hands-free operation, if available.
Ӣ Pull off the road and park before making or answering a
call if driving conditions so require.