I don't believe it will do text without a sub. T-Mobile and others like that to be a paid feature usually.
I am going to correct you on that, unless its built into the 55 $70plus plan(Which is entirely possible) I have it working now, if you need a screen shot to prove it I can put one up.
I needed to uninstall Google voice, and T mobile visual voicemail, I cleared the Cache in the phone app and it started working on the next voice mail I got.
Its showing up in the native phone app. When any of the VV mail apps get installed the VVM in the native app gets turned off so they needed to be gone...The cache clearing is what seemed to get it working tho.