Originally Posted by Big_Rich

In the phone dialer app, when you click on Menu > Options... > Services tab.

The items listed are what that references.
Unaltered that list includes Call Forwarding, Call Waiting, SMS, BC SMS. With those items exposed you're able to change certain values to your personal taste. Like totally disabling Call Waiting if you wanted. Or setting up your Call Fowarding w/o having to dial Verizon's special numbers. etc.