Operations that can be performed while talking     

If you press the triangle button while you are talking, the options menu will be displayed. From this menu, you can put the call on hold or display a profile.

Hold Put the call on hold.
Dial Pad Enter digits.

You can send tone signals. Tones are used for phone conversations that must be controlled by entry of digits, such as when you call an answering machine.
Hang Up Disconnect the phone call.
View Profile Display the contact's profile.