Vonage's 3-Way Calling feature is offered in the standard phone plan and enables you to call one person, then add a third person to the conversation so all three of you can talk at once. This can be used when you need to pass along information but don't want to go through the hassle of hanging up, calling the second person and then re-calling the first person. Or, you can use this feature just to chat with two friends or business associates simultaneously.
Call the first person.
Press the flash button on the phone and dial the number of the second person.
Press the flash button a second time, after the second person answers the phone, and the three of you will be connected.