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Area Code Overlay Approved for the Oklahoma 405 Area Code

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Attention: Alarm and Security Service/Equipment Providers
To ensure a continuing supply of telephone numbers, the new 572 area code will be added to the area currently served by 405. The new 572 area code will serve the same geographic area currently served by the existing 405 area code which serves all or portions of 19 counties in the central part of the state which includes Oklahoma City, the state capital and state’s most populous city.

What is an area code overlay?
An overlay is the addition of another area code (572) to the same geographic region as an existing area code (405). An overlay does not require customers to change their existing area code. How does this affect providers of alarm and security services and equipment?
As a result of the overlay, a new local dialing procedure requires callers to dial area code + telephone number. Alarm and security services and equipment currently located in the 405 area code and programmed to dial only seven digits must be updated or reprogrammed to dial area code + telephone number or 1+area code +telephone number for all calls in the 405/572 area code.

What will be the new dialing procedure?
To complete local calls, the new dialing procedure requires callers to dial area code + telephone number. This means that all calls in the 405 area code that are currently dialed with seven digits will need to be dialed using area code + telephone number. The same dialing procedure will apply to telephone numbers assigned to the new 572 area code.

When will the change begin?
Effective October 24, 2020, the new dialing procedures should be used whenever a call is placed from the 405 area code. If the caller forgets and dials just seven digits, calls will still be completed. Beginning April 24, 2021, the new dialing procedure must be used, as described above. On and after this date, if callers do not use the new dialing procedure, calls will not complete. A recording will instruct the caller to hang up and dial again including the area code. Reprogramming of alarm equipment should be completed by April 24, 2021.To verify that equipment can complete calls to the new 572 area code, a special test number, 572-572-1572, will be in service beginning February 24, 2021 and it will remain active through June 24, 2021.Beginning May 24, 2021, new telephone lines or services may be assigned numbers using the new 572 area code.

What will remain the same?
• 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.
• Emergency services can still dial just three digits to reach 911.
• If 211, 311, 411, 511, 611, 711 or 811 are currently available in your community, these calls may still be dialed using just the three digits. Who may you contact with questions?

Customers with questions regarding the dialing procedure change should be directed to their local service provider, or they can contact the Oklahoma Corporation Commission, Public Utility Division Sumer Services (open Monday-Friday, 8:00 am – 4:30 pm) 405-521-2331