I donated a nominal amount. Hadn't realized that there were thresholds to view the upgrade schedule.
I am a Canadian who every other week or so travels through Champlain, NY 12919, Plattsburgh, NY 12901, St. Albans, VT 05478, South Burlington, VT 05403 and Williston, VT 05495 using my Nexus 5 on a grandfathered Ringplus account, a Sprint MVNO. For my limited usage, it's a perfect match.
Other than Verizon, have tried every other carrier in the aforementioned areas. Coverage has been abysmal. Only as of recent has Sprint really improved. Hopefully the upgrade schedule you speak of hits a lot of those towers.