This configuration remained in place until 1995, when resource pressure from the proliferation of cell phones, fax machines, and pagers, required additional central office prefixes and telephone numbers. Most of the region outside the Seattle and Tacoma areas was split from 206 to form a new numbering plan area with area code 360.
The telephone system's configuration remained unchanged until 1995 when resource constraints due to the rise in cell phones, fax machines, and pagers prompted the need for additional prefixes and phone numbers. The region outside Seattle and Tacoma was separated from 206 to form a new area code, 360.