Palm 650 User Manual page 76

Press Power/End
Select Hang Up.
Press the headset button (if the headset is attached).
Tip:
Returning to an Active Call From Another Application
You can use many other applications on your Treo 650 while holding a phone
conversation, including the organizer and text messaging features. You cannot
browse the Web or send and receive email while on an active call.
From any application, press Phone/Send
Making a Second Call
You can make a second call while your first call is
still active.
1.
After dialing the first number, use the 5-way
to select Hold.
2.
Use the 5-way
3.
Dial the second number using Favorites, Contacts,
Dial Pad, Call Log, or Redial list (see "Making Calls"
on page 52).
4.
Press Power/End
64
.
When a call lasts longer than one minute, the screen turns off. Press any
key except Power/End to wake up the screen, and then press Power/End
to hang up the call. Be careful not to press Power/End to wake up the
screen as this will accidentally end the call.
to select Add Call.
to end both calls.
to return to the Active Call view.
Section 2B: Using Your Device's Phone Features