10-Digit Dialing Comes to California

Starting October 24, 2021, 10-digit dialing is mandatory in nine area codes throughout California, including parts of the East Bay. Area codes affected are 209, 530, 562, 626, 650, 707, 925, 949 and 951. 


This change comes from the Federal Communications Commission (FCC), which recently established 988 as the new nationwide three-digit phone number for the National Suicide Prevention Lifeline.

Who is affected by this change? Callers who have telephone numbers with a 988 exchange or central office code, the first three numbers of a seven-digit phone number. They must now dial both the area code and the telephone number of any party they are trying to reach. If they do not, the call won’t go through, even for local numbers. Calls made using only seven digits will not be completed; users will be instructed to hang up and try again using the correct 10-digit format.

Does this affect your alarm system? If your phone number begins in 988, then your alarm may need the area code programmed into its system so that it can connect again to our monitors. If not programmed in, your system will dial out, but it will not connect with us.

If you experience a com-fail on your keypad, or if it doesn’t appear as if your alarm system is connecting to ours, please contact our Business Office at 925-932-2211, Monday through Friday, 9 a.m. to 5 p.m., and we will come reprogram your system. Thank you for your patience and understanding!

Denalect Alarm is proud to serve home and business security and alarm systems in Northern California: Antioch, Blackhawk, Concord, Danville, Dublin, El Cerrito, Hercules, Lafayette, Livermore, Martinez, Moraga, Oakley, Orinda, Pittsburg, Pleasant Hill, Pleasanton, San Ramon and Walnut Creek.

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