SAN FRANCISCO (AP) — Southern California residents and businesses in the 909 area code need to get ready for the overlay of an 840 area code and a change in dialing procedure, state regulators said Thursday. The overlay is intended to ensure a continuing supply of telephone numbers in southwestern San Bernardino County, eastern Los Angeles County and small portions of Orange and Riverside counties. The overlay will require customers to dial 1 plus the three-digit area code for all calls from telephone numbers with 909 and 840 area codes, including local calls, the California Public Utilities Commission said. Phone customers with a 909 number can begin using the new dialing procedure on July 25 and it will become mandatory on Jan. 23, 2021. Three-digit dialing for numbers such as 911
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