If you want to name a smartphone wide variety assigned to area code 623, you need to dial the whole 10-digit range, including the vicinity code. In the end, place code 623 covers the west-central portion of Arizona, including the Phoenix metropolitan place, and was created in 1999 as an overlay of the original location code 602. If you’re calling from the United States or Canada, you do now not need to dial a rustic code or worldwide prefix before the smartphone number. If you are trying to name a smartphone-wide variety assigned to region code 623, you must dial the full 10-digit range, including the vicinity code. In addition to serving Phoenix and its surrounding suburbs, location code 623 covers portions of Arizona’s Maricopa and Yavapai counties. The advent of location code 623 allowed for the expansion of the smartphone-wide variety available in the Phoenix metropolitan region, which has experienced considerable population growth in latest a long time. Overlays are normally brought when the call for telephone numbers in a particular location exceeds the available delivery of numbers under the existing place code. An overlay is a telecommunications term that refers to adding a new vicinity code inside the same geographic location as an existing region code.