This app is for AT&T landline voicemail, not mobile phone voicemail. Make sure you have your AT&T office voicemail PIN prior to downloading this app. You must have an AT&T Phone (Business VoIP) or an AT&T Unified Messaging℠ account in order to use this app. Business customers can order AT&T Unified Messaging by calling the number on their bill or by visiting att.com. For information about AT&T Phone (Business VoIP), please contact your AT&T Account Representative. The AT&T Voicemail Viewer app makes it easier to stay on top of your digital Voicemail or Unified Messaging voicemail messages directly from your iOS device. Similar to looking at messages in your email inbox, Voicemail Viewer lists your messages, allowing you to choose the order in which you listen to them. With digital Voicemail, you can even read your messages as voicemail-to-text. For more information and help, visit um.att.com/vmviewer. If you are a digital Voicemail or an AT&T Unified Messaging customer and are experiencing difficulty logging in to this app, please contact us at 800.288.2020 (digital Voicemail) or 888.300.6500 (Unified Messaging) and be prepared to provide your wireline phone number associated with your mailbox, the device you are using to access the app and the problem that you are experiencing.