HTC EVO V 4G Basic Manual page 11

Basics Guide 11
Auto Top-Up
Auto Top-Up is the easiest way to keep your service working. Set it to Top-Up
your account once a month so you can keep emailing, IMing, Tweeting with
Twitter, surfing, and talking. No interruptions, no sweat. Activate Auto Top-Up
and adjust your settings anytime by logging in at virginmobileusa.com.
One-Time Top-Ups
From Your Computer:
If you don't want to set Auto Top-Up, you can still log in at
virginmobileusa.com whenever you need a quick Top-Up.
From Your Phone:
Just dial *729 on your phone or tap My Account on the Home screen.