AT&T Southeast in Summerfield, NC
These numbers are located in the city of Summerfield part of Guilford county. There are a few other subcodes that cover this area as well so take care not to confuse them.
Guilford county is situated in North Carolina and operates ET (UTC -05:00) time. This number group covers the 27358, 27310, 27357, & 27235 zip codes.