Returning to an active call from another application
You can use many other applications on your Treo while holding a phone conversation, including the organizer and SMS features. You cannot browse the web or send and receive email while on an active call.
• From any application, press Phone/Send 
to return to the Active Call View.
Saving phone numbers
After you complete an incoming call from a number (with caller ID) that is not in your Contacts list, you are prompted to add the number to your Contacts list.
•To add the number, select Yes.
•To decline adding the number, select No.
•To permanently disable the Add New Contact prompt, check the Never ask me to add new Contacts box when the prompt appears.
If you don’t add a number right away, follow these steps to add it later:
1.In the Call Log (see “Redialing a recently called number” on page 43), highlight the number you want to save.
2.Select Add Contact.
3.Enter the information for the entry.
4.Select Done.