On Verizon Wireless, I can use the green phone button as follows:
1. To add a second party:
Press the green phone button once to bring up the 'flash' screen, Press the Main menu button that appears on the screen to select your contacts or call log in order to select another number (or simply dial another number then press the green phone button to dial); Press the green phone button once again to conference (as soon as you hear the second call ring), Press the green phone button once again to drop the second call (you cannot drop the first party without hanging up altogether).
2. When the second party calls me (call waiting):
Press the green phone button once to connect to the second call.
Press it again and again to toggle back and forth between parties (you cannot conference in this mode).
The above is based on Verizon wireless usage. Not sure if it differs with others. |