i just called my voicemail and while that was on speaker i went on chrome and looked up some info on amazon. next time i'm on the phone with someone i'll do another check.
Yup, I don't think there will be many phones on Verizon anymore that support SVDO considering their continuing expansion of LTE and its support of SVLTE. If memory serves the only phones on Verizon that support SVDO yet are the Thunderbolt, Rezound and Galaxy S3 (not sure about the Galaxy S4).
Most newer phones don't have this setup primarily due to the aforementioned rollout/support of SVLTE, but also probably due to the extra hardware cost of the unique radio/antenna setup and complexity of managing those radios so they don't exceed FCC SAR requirements. Again, see the AnandTech article.