I had the S9+, upgraded to Note 10+. Quickly killed VoLTE. Calls on 1x are amazingly more reliable and penetrate very deep into buildings and even basements. Perfectly clear. On LTE? I'm lucky to make it 15 or 20 feet inside of a building and the call breaks up and cuts out entirely. They'd better leave that as an option for the foreseeable future or until Tmo sweeps in and works their magic.