All I could find on the subject
Recent HTC phones include a special version of AT&T Visual voicemail. As a result it's no long possible to download and install the standard vvm app from the play store. I've installed ARHD and would like to figure out how to get AT&T visual voicemail on this particular rom.
I've tried extracting the visual voicemail apk from my stock nandroid, but can't get it to work. I've installed it but the app doesn't appear with my other apps.
I can't post a link, but here's a copy paste of what I found on the at&t site regarding the m8 and visual voicemail.
Visual Voicemail for HTC Android smartphones
Starting in March 2014, all new 4G LTE HTC Android smartphone models will include a new, built-in Visual Voicemail application. The HTC One (M8) is the first Android smartphone to introduce the new HTC Visual Voicemail app.
If you have an earlier model HTC Android smartphone and use the AT&T Visual Voicemail downloadable app for Android, your experience won't change. Follow the link above to view a list of supported smartphones.
Key features and benefits of the new HTC Visual Voicemail app for Android smartphones include:
New Message Counter displayed on the Visual Voicemail app icon, so you can quickly check if you have new messages from your smartphone app tray.
Text Transcription you can turn on and off from within the app, so you can read your voicemail messages discreetly on your smartphone.
Visual Voicemail icon button built into the app tray and dialer for quick access to your Visual Voicemail message inbox.
With Visual Voicemail on your HTC Android smartphone, you can:
View a list of your voicemail messages directly on your smartphone and play them in any order you choose, so you can get to your most important messages first.
Save messages to your smartphone's memory or memory card, so you can keep your important messages for as long as you want.
Reply to messages by returning the call or sending a text message.
Change your voicemail password and manage greetings directly on your smartphone.
Requirements to use Visual Voicemail
In order to use the Visual Voicemail app on your 4G LTE HTC Android smartphone:
Your smartphone data plan must include Visual Voicemail.
Your smartphone needs a cellular data connection. You can't set up or manage your Visual Voicemail over a Wi-Fi-only connection on your smartphone.