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End a call 
Touch the    button to hang up the call. 
Adjust the volume 
In a call, you can raise or lower the volume by using the volume keys.   
Turn the speaker on or off   
In a call, touch the    button to turn on the speaker, and touch it again to turn off speaker. 
Add a multi party or Conference call 
In a call, touch    for Options then Add call. Dial a number and touch the phone icon to add one 
call and put the current caller on hold. Press Options > Merge to join the two (or more) parties 
together.   
Use touch tones during a call for automated call systems 
Touch the 
 
button to open the dial pad to enter numbers during a call.