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California 408/669 Area Code Overlay

Important: 408 Area Code Dialing Changes

To meet increasing demand the CPUC (California Public Utilities Commission) is adding a new area code overlay for the 408 area code on October 20, 2012. This overlay adds a new 669 area code that serves customers in the same geographic area as the current 408 area code.

Effective October 20, 2012, all local calls from the 408 area code must be dialed using 11 digits, 1 + area code + seven-digit telephone number. For example: 1-408-555-5555.

The 408/669 area code covers Santa Clara County, California, as well as neighboring cities and small unincorporated portions of Alameda and Santa Cruz Counties. Primary cities in the 408/669 area code include San Jose, Campbell, Cupertino, Gilroy, Los Gatos, Milpitas, Monte Sereno, Morgan Hill, Santa Clara, Saratoga, Sunnyvale, and portions of Palo Alto and Fremont.

General Information

What is an Area Code Overlay?
An overlay is the addition of another area code (669) to the same geographic region as an existing area code (408) in order to accommodate an increased supply of telephone numbers. It does not require you to change your existing area code or telephone number, but it requires you to change the way you dial your calls. 

Who is impacted by the Area Code Overlay?

Anyone who has a telephone number with a 408 area code is impacted by the change as well as anyone that receives a telephone number from the new 669 area code in the future. The 669 area code covers the same geographic area as the 408 area code.

When does the change begin?

You can use the new dialing procedures immediately when placing a call from the 408 area code. If you forget and dial just seven digits, your call will still go through until October 20, 2012.

Starting October 20, 2012, all local calls from the 408 area code must be dialed using 11 digits, 1 + area code + seven-digit telephone number. After this date, if you do not use the new dialing procedures, your calls will not be completed and a recording will instruct you to hang up and dial again.

Beginning November 20, 2012, the new telephone lines or services may be assigned numbers with the 669 area code.

What is the new dialing procedure for customers with a 408 or 669 area code?

All local calls from the 408 area code must be dialed using 11 digits, 1 + area code + seven-digit telephone number. Dialing procedures for long distance calls  remain the same (1 + area code + seven-digit telephone number).

What will I need to do to prepare?
In addition to changing the way you dial a call, automatic dialing equipment or other types of equipment that are programmed with a 7-digit number will need to be reprogrammed to use the new dialing procedures.
  • Reprogram any equipment or features i.e., automatic dial, speed-dial, call forwarding, modems for computer or internet dial-up access, etc., that use a telephone dialer.
  • Check items like stationary, checks, etc. to make sure area code is included
  • When asking for someone else’s number, remember to ask for the area code too.
  • Check your call forwarding settings to be sure you are using 11-digit dialing and not 7-digit dialing.
Some examples of items that could be affected are life safety systems, PBXs, fax machines, Internet dial-up numbers, alarm and security systems, gates, speed dials, call forwarding settings, voice mail services, etc.

What remains the same?

The following items will remain the same:
  • Your telephone number, including current area code, will not change.
  • The price of a call, coverage area, or other rates and services will not change due to the overlay.
  • What is a local call now will remain a local call regardless of the number of digits dialed.
  • No additional digits will be required to make emergency calls. You can still dial just three digits to reach 911
 If you have additional questions regarding the 408 / 669 Area Code Overlay, visit the CPUC website at