The 253-439 exchange is serviced by the following companies within the TACOMA ratecenter.
"MCI WORLDCOM COMMUNICATIONS, INC. - WA"
Call are routed trough OCN 7274 and CLLI - KRLDWADWDS1 (Common Language Location Identifier Code) and Point of Interface (POI) switch which is located in KIRKLAND.
Who's number is 253-439 Numbers?