From the home screen, tap the AT&T folder. Note: Alternately, you can set up voicemail by pressing and holding the number 1 key.
Tap Set as Default.
Tap Call Voicemail to call voicemail, then, end the call. Note: NOTE: No need to check your messages. Just end the call and the setup will continue.
Visual Voicemail has been set up. Tap Voicemail to view visual voicemails. Note: NOTE: You can also access AT&T Messages on the web to view, send, and manage your messages, voice texts, and visual voicemail. Visit www.messages.att.net on your computer to get started.