Hello! I tried Sprint out last year and recently tried it out again. There's B26 all over the Germantown area, by the river, Mud Island, from Memphis to Brownsville TN and Jackson TN. Coverage has greatly increased compared to last year. It was good enough that I decided to port my main and secondary lines over to Sprint. We didn't get 4G around Gallaway TN or most of 70/79 from Memphis to Jackson, but we usually don't drive that route anyway. I40 from Memphis to Jackson has 4g about 90% of the way now. To my surprise, the 4G is solid in Brownsville TN with B25 and B26 both being pretty strong. Millington is somewhat spotty, but usable.
BTW, I have not seen B41 anywhere yet.
Hope this helps!
:-)