You need B26 for VOLTE both for coverage and capacity. B41 as it is configured right now is great for cruising the net and downloading. Not great for symmetric traffic like voice. Well, when I am talking to my wife, it is highly asymmetric but that's neither here nor there😂.
I was on I-68 Sunday and did not notice any new Sprint Coverage. Some 1x was there, no Sprint LTE. The 1X was well below the standards we would expect and I really did not see any improvement yet. However, as I write this, I am thinking that the US Cellular LTE might have been showing on SCP and I may not have realized that Sprint 1x was available in previously uncovered locations.
I was in Cumberland, Md and Deep Creek , Md on Sunday. Only had Sprint 1x and the coverage on that was not good. However, I did have LTE coverage on US Cellular. It was OK, not fantastic, but ok. Not everywhere but it was where you needed it. Was on US Cellular EVDO and 1x at times too. It was great that Sprint allows use of US Cellular facilities while they upgrade their network.
Allegany and Garrett counties were ignored by Sprint for many many years. Now that they have turned that area over to Shentel we are going to see the service greatly improved. Sprint finally did the right thing. If they could not provide service in the area themselves, turn it over to somebody that can and will. Shentel WILL fix it and soon.
I did note that when driving into the area from Hagerstown, my phone resisted connecting to US Cellular LTE until I started trying to figure out why. I think it might have been the Airplane mode on/off action I took that seemed to wake up US Cellular LTE. Once it connected one time, then I was good all day.
There are clearly some issues with that map, but you're right, western MD does look good and like they're planning to cover it well. Looking at the current Sprint coverage map in voice view, it looks like two or three new sites might be up and running already along I-68. (If not, then they might be coming very soon.)