Handspring Treo 600 - Manual (Page 43)

More ways to manage calls
Treo offers many advanced telephone features, including call waiting,
conference calling, and call forwarding.
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 navigation control to
choose Hold.
2. Use the navigation control to choose Add Call.
3. Dial the second number using Favorites, Contacts, Dial Pad, Call Log, or
Redial list (see pages 36-38).
The Active Call view now includes two status lines, each representing one of
the calls. To switch between the two calls, choose Swap.
More ways to manage calls :: 43
You can use nearly any
other application on Treo
while holding a phone
conversation, including the
organizer features and
SMS. You cannot send and
receive email while on an
active call. To return to an
active call from another
application, press Phone
.