MAKING CALLS CONTINUED
 
Function  Action
Toggle between two  Press and hold
active calls    the Call button
Join a 3-way call    Press and hold
   both Volume buttons
Put an active call on  Press and hold the
hold or resume a call  Call button until you
on hold      hear a beep
Disable or enable the  Press and hold
indicator light    both Volume
      buttons for 3 to 4 
   seconds
Mute or unmute a call  Tap both Volume 
   buttons
Note: Some features are phone/network dependent.