There's a default voicemail icon/app on Sprint phones. On my old (pre-Ting) HTC and on my new SII's it downloads voicemail to the phone. So when you open it there's a list of messages to play, delete, forward, etc.
But on my new Transform Ultra, same looking icon but all it does is autodial voicemail and I'm stuck with "Press 1 to listen..." etc. There's no settings that I can find on the Ultra to change it.
I don't see a similar icon/app in Google Play so I'm guessing this was something from Sprint?
Ah, wait. On the SII I found an About. It's Voicemail T.220.127.116.11 from SmithMicro. I still can't find it on Play.