Something else I forgot to mention, the V40 is enabled for calling plus on LTE and wifi, and it has been working very well so far. I usually keep it disabled for WiFi, since my WiFi is a bit weak in some parts of my house.
A little anecdotal note on radio performance. I am currently a location with known poor coverage. We have 3 new phones - iPhone XS, XS Max, and LG V40. The iPhones are having no trouble picking up a usable LTE signal inside, but the V40 only connects to 3G unless I go outside, and the data is barely usable. It is band 26 LTE (800MHz) based on Signal Check on the V40 when I go outside and pick up the LTE signal. Actually now that I think about it, the V40 is probably on 1xrtt inside, not 3G, because Signal Check is showing 800 for both CDMA and LTE.
I second the LG V30+.
I've had mine for over a year now, and I'm very pleased with the RF performance. I too live in a somewhat rural area, and also travel quite a bit, and I haven't been disappointed at all. RF performance is high on my list of must-haves when shopping for a new phone.
The V30+ also makes use of all the current network technologies offered by Sprint, as far as I know. I haven't been able to test out VoLTE yet (not live in my home area), but it's on the compatibility list.
I haven't been shopping, but I have seen the V30+ offered at very good prices recently.