The 509-788 exchange is serviced by the following companies within the PROSSER ratecenter.
UNITED TELEPHONE-NORTHWEST-WA DBA CENTURYLINK-WA
Call are routed trough OCN 4521 and CLLI - PRSRWAXARS0 (Common Language Location Identifier Code) and Point of Interface (POI) switch which is located in PROSSER.
Who's number is 509-788 Numbers?