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 … ...

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.

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.

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

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.

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

Here is what you need to know about the addition of a new area code: • Existing numbers with a 909 area code will not change — this includes landline and mobile phones.