At first, VoLTE will be used to deliver "Rich Communications Services" (which look like something similar to what Voice over IP/Video over IP outfits offer today) rather than completely replacing narrowband voice. It will be awhile before Verizon is willing to commit to that, due in part to LTE outages in late 2011.
On the flip side is MetroPC, which has pushed VoLTE as hard as it could.
Then there's Sprint, which will stick to voice over 1x for the foreseeable future, but routes Direct Connect over IP. Sprint's latest DC incarnation seems quite similar to one facet of RCS over LTE.
Hurray!!!! I roamed on Band 4 today. The merger is real for me finally 😁. But then it went into Sprint 3G in the spot in the house that I had reliable if slower band 25. Maybe they are still configuring this area.
One thing I noticed... He didn't "@" Sprint. He did "#" instead. Perhaps the new brand guidelines are already a thing?
See this video from his Tweet as well: https://www.youtube.com/watch?v=gblKI87IcaM&t=
EDITED: I just noticed in a later tweet that did "@" Sprint.... False alarm.