The 909 is running out of phone numbers.The California Public Utilities Commission is aiming to introduce a new area code to the region served by the 909 — which includes cities from Walnut … ...

The 11-digit dialing process will be mandatory starting Jan. 23 for all customers with a telephone number in the 909 area code.

1: Callers with 909 area codes must dial 1 ahead of the area code and telephone number for all calls. 2: Calls that do not follow the new dialing procedure will not be completed, CPUC officials say.

The number crunch is prompting the commission is introducing a new area code to the 909 territory, she said.

State PUC orders switch to 951 for western Riverside County to ease number shortage. San Bernardino County will retain 909 area code.

The California Public Utilities Commission is poised to split the 310 and 909 area codes this summer based on the "Chicken Little" threat that we are running out of phone numbers.

A new area code could soon be added to cities served by the 909. That has local businesses worried about what that means for their existing numbers and advertising.

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.