Hey there, magenta3720490!
Welcome to T-Mobile and our Support Community! I checked out to the two ski areas you referenced in Southern Vermont and can confirm we currently don't have any coverage there nor do I see any upcoming plans for the area.
Thank you for the information.
Sent from my iPhone
Family members with iPhones are able to roam on US Cellular in Wilmington VT, but my TMobile branded Note 4 will not register.. I get a message like "Your SIM card does not permit registration..." I have 5 bars, and diagnostics mode shows I'm on band 12, US Cellular "limited service." My software is up to date, roaming is turned on, and VOLTE preferred is turned on.
How can I fix this ?