T-Mobile in Nantucket, MA
These numbers are located in the city of Nantucket part of Nantucket county. There are a few other subcodes that cover this area as well so take care not to confuse them.
Nantucket county is situated in Massachusetts and operates ET (UTC -05:00) time. This number group covers the 2554, 2584, 2584, & 2564 zip codes.