Hangup
From TreoCentral
[edit]
Normally
On any Treo: Press the red end button, or click hangup.
[edit]
In three way mode
On Sprint Treo 600 and Treo 650: To return to a call that is on hold while you are on another one, press the hang up all button and the orginal call will ring your phone back.
On Cingular (and perhaps other GSM carriers): Type the backspace (aka delete) key. This will hang up the call you are currently on and put you on the call that was on hold.
