Area Code Splits & Overlays

What is an area code split?

The exhausting area code is split into two or three geographic areas, leaving the existing area code to serve one side of the geographic area and assigning one or two new area codes to the other segment(s).

What is an area code overlay?

An area code overlay occurs when more than one area code serves the same geographic area. In an area code overlay, relief is provided by opening up a new area code within the same geographic area as the area code requiring relief. With an overlay, all current customers keep their area code and telephone number. Numbers from this new area code may be assigned to new telephone customers or those adding additional lines. Because two area codes reside in the same geography, all calls must be dialed using the area code + the seven-digit telephone number (10 digits). (Some states require 1+10-digit dialing)

What is 10-digit dialing?

10-digit dialing is a term used to refer to the practice of including the area code of a phone number when making local calls. It is the required dialing pattern in locations throughout the country that have undergone an area code Overlay. For example, if area code (123) is overlaid with area code (456), then callers within the area served by 123/456 must dial 10-digits in order to place a local call even if the call is from a (123) number to another (123) number. Pre-subscribed long distance calls still require 1+10-digit dialing. Consumers in areas subject to an Overlay should replace all 7-digit telephone numbers programmed into their wireless phones and other devices with 10-digit telephone numbers.

What is Permissive Dialing?

The permissive dialing* period begins with the introduction of the new area code and generally lasts approximately six months. It provides a 'get acquainted' transition period for the new area code. Permissive dialing allows the old and new area code customers to call between the two area codes using seven-digit dialing. During this period, customers should begin to use the area code + the telephone number although calls will still complete if only the seven-digit telephone number is dialed. Customers, from outside the area, can call the new area code by dialing either the old or the new area code + the telephone number; the call will complete during the permissive period. (* The permissive dialing period varies in length per commission decision)

What is Mandatory Dialing?

Approximately six months after the introduction of the new area code, an intercept recording period will begin. At this time, callers must use the appropriate area code plus the telephone number. Calls incorrectly dialed will be referred to a recording throughout the recording period. It will inform the calling party that the new area code must be used to complete the call.

If you have family or friends deployed in the military outside of the United States, make sure they know and use your new area codes.


 

The New 861 Area Code is Coming to the Illinois 309 Area Code Region

 

To ensure a continuing supply of telephone numbers, the Illinois Commerce Commission has approved an all-services overlay for the 309 area code. The 309 area code serves the west-central portion of the state, including all or part of Bureau, Dewitt, Fulton, Hancock, Henderson, Henry, Knox, Marshall, Mason, McDonough, McLean, Mercer, Peoria, Rock Island, Schuyler, Stark, Tazewell, Warren, Whiteside, and Woodford counties. The 309 area code serves cities and communities such as Bloomington, Canton, East Moline, East Peoria, Galesburg, Macomb, Moline, Normal, Pekin, Peoria, and Rock Island, as well as many other smaller communities. The new 861 area code will serve the same geographic area currently served by the 309 area code.

 

What is an Area Code Overlay?

An overlay is the addition of another area code (861) to the same geographic region as an existing area code (309). The overlay does not require you to change your existing area code or phone number, or how you dial your calls. You will continue to dial the area code and phone number for all local calls, as you do today, within and between the 309 and 861 area codes.

 

Who is affected and when does the new 861 area code become effective?

Beginning February 24, 2023, customers in the 309 area code region may be assigned a number in the new 861 area code when they request new service or an additional line. Customers receiving the 861 area code will be required to dial the area code and phone number for all local calls, just as customers with telephone numbers from the 309 area code do today. 

 

What will you need to do?

Customers in the overlay region should:

  • Continue to dial 10 digits for all local calls, including calls within the same area code.
  • Continue to identify your telephone number as a 10-digit number, and include the area code when giving the number to friends, family, business associates, customers, etc.
  • Ensure that all services, automatic dialing equipment, or other types of equipment recognize the new 861 area code as a valid area code and continue to store or program telephone numbers as 10-digit numbers. Some examples are: stored telephone numbers in contact lists in wireless phones, PBXs, fax machines, Internet dial-up numbers, speed dialers, call forwarding settings, voicemail services, medical alert devices, safety alarm security systems and gates, ankle monitors and or other similar equipment.
  • Check items such as your website, personal and business stationery, printed checks, advertising materials, contact information, and your personal or pet ID tags to ensure the area code is included.

 

What 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.
  • You will continue to dial 10 digits for local calls within and between the overlay area codes, and 1+10 digits for long distance calls.
  • You can still dial just three digits to reach 911 and 988, as well as 211, 311, 411, 511, 611, 711 or 811 if those are currently available in your community.

 

Who may you contact with questions?

If you have any questions regarding information provided in this notice, please call T-Mobile USA at 1-877-453-1304 for more information. You may also visit the Illinois Commerce Commission website at https://www.icc.illinois.gov/programs/Area-Codes.


 

The New 329 Area Code is Coming to the New York 845 Area Code Region

 

To ensure a continuing supply of new telephone numbers, the New York Public Service Commission has approved an all-services area code overlay for the 845 area code region. The 845 area code serves all or parts of Columbia, Delaware, Dutchess, Greene, Orange, Putnam, Rockland, Sullivan, and Ulster counties, including a portion of Westchester County. The new 329 area code will serve the same geographic area currently served by the existing 845 area code.

 

What is an Area Code Overlay?

An overlay is the addition of another area code (329) to the same geographic region as an existing area code region (845). The overlay does not require you to change your existing area code or phone number, or how you dial your calls. You will continue to dial the area code and phone number for all local calls, as you do today, within and between the 845 and new 329 area codes.

 

Who will be affected and when does the new 329 area code become effective?

Beginning March 24, 2023, customers in the 845 area code overlay region may be assigned a number in the new 329 area code when they request new service or an additional line. Customers receiving a 329 area code will still be required to dial the area code and phone number for all local calls, just as customers with telephone numbers from the 845 area code do today.

 

What will you need to do?

Customers in the overlay region should:

  • Continue to dial 10 digits for all local calls, including calls within the same area code.
  • Continue to identify your telephone number as a 10-digit number, and include the area code when giving the number to friends, family, business associates, customers, etc.
  • Ensure that all services, automatic dialing equipment, or other types of equipment recognize the new 329 area code as a valid area code and continue to store or program telephone numbers as 10-digit numbers. Some examples are: stored telephone numbers in contact lists in wireless phones, PBXs, fax machines, Internet dial-up numbers, speed dialers, call forwarding settings, voicemail services, medical alert devices, safety alarm security systems and gates, ankle monitors and or other similar equipment.
  • Check items such as your website, personal and business stationery and printed checks, advertising materials, contact information, and your personal or pet ID tags to ensure the area code is included.

 

What 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.
  • You will continue to dial 10 digits for local calls within and between the overlay area codes, and 1+10 digits for long distance calls.
  • You can still dial just three digits to reach 911 and 988, as well as 211, 311, 411, 511, 611, 711, or 811 if those are currently available in your community.

 

Who may you contact with questions?

If you have any questions regarding information provided in this notice, please call T-Mobile USA at 1-877-453-1304 for more information. You can also visit the New York Public Service Commission website at https://www3.dps.ny.gov/W/PSCWeb


 

The New 728 Area Code is Coming to the Florida 561 Area Code Region

 

To ensure a continuing supply of telephone numbers, the Florida Public Service Commission has approved an all-services overlay for the 561 area code. The 561 area code serves Belle Glade, Boca Raton, Boynton Beach, Delray Beach, Jupiter, Palm Beach, and Wellington, as well as other smaller communities. The new 728 area code will serve the same geographic area currently served by the 561 area code.

 

What is an Area Code Overlay?

An overlay is the addition of another area code (728) to the same geographic region as an existing area code (561). The overlay does not require you to change your existing area code or phone number, or how you dial your calls. You will continue to dial the area code and phone number for all local calls, as you do today, within and between the 561 and 728 area codes.

 

Who is affected and when does the new 728 area code become effective?

Beginning March 10, 2023, customers in the 561 area code region may be assigned a number in the new 728 area code when they request new service or an additional line. Customers receiving the 728 area code will be required to dial the area code and phone number for all local calls, just as customers with telephone numbers from the 561 area code do today.

 

What will you need to do?

Customers in the overlay region should:

  • Continue to dial 10 digits for all local calls, including calls within the same area code.
  • Continue to identify your telephone number as a 10-digit number, and include the area code when giving the number to friends, family, business associates, customers, etc.
  • Ensure that all services, automatic dialing equipment, or other types of equipment recognize the new 728 area code as a valid area code and continue to store or program telephone numbers as 10-digit numbers. Some examples are: stored telephone numbers in contact lists in wireless phones, PBXs, fax machines, Internet dial-up numbers, speed dialers, call forwarding settings, voicemail services, medical alert devices, safety alarm security systems and gates, ankle monitors and or other similar equipment.
  • Check items such as your website, personal and business stationery, printed checks, advertising materials, contact information, and your personal or pet ID tags to ensure the area code is included.

 

What 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.
  • You will continue to dial 10 digits for local calls within and between the overlay area codes, and 1+10 digits for long distance calls.
  • You can still dial just three digits to reach 911 and 988, as well as 211, 311, 411, 511, 611, 711 or 811 if those are currently available in your community.

 

Who may you contact with questions?

If you have any questions regarding information provided in this notice, please call T-Mobile USA at 1-877-453-1304 for more information. You can also visit the Florida Public Service Commission website at http://www.psc.state.fl.us/Telecommunication/TelecomAreaCodes


 

The New 369 Area Code is Coming to the California 707 Area Code Region

 

To ensure a continuing supply of telephone numbers, the California Public Utilities Commission has approved an all-services overlay for the 707 area code region. The 707 area code serves all or portions of Del Norte, Glenn, Humboldt, Lake, Marin, Mendocino, Napa, Solano, Sonoma, Tehama and Trinity counties, and encompasses cities such as American Canyon, Arcata, Benicia, Calistoga, Clearlake, Cloverdale, Cotati, Crescent City, Dixon, Eureka, Fairfield, Ferndale, Fort Bragg, Healdsburg, Lakeport, Napa, Petaluma, Point Arena, Rio Dell, Rio Vista, Rohnert Park, Saint Helena, Santa Rosa, Sebastopol, Sonoma, Suisun City, Trinidad, Ukiah, Vacaville, Vallejo, Windsor, Willits, and Yountville. The new 369 area code will serve the same geographic area currently served by the 707 area code.

 

What is an Area Code Overlay?

An overlay is the addition of another area code (369) to the same geographic region as an existing area code (707). The overlay does not require you to change your existing area code or phone number, or how you dial your calls. You will continue to dial 1+10 digits (area code + phone number) for all local calls, as you do today, within and between the 707 and 369 area codes. Mobile phone customers will continue to dial either 10 digits or 1+10 digits.

 

What will you need to do?

Customers in the overlay region should:

  • Continue to dial 1+10 digits for all local calls, including calls within the same area code.
  • Continue to identify your telephone number as a 10-digit number, and include the area code when giving the number to friends, family, business associates, customers, etc.
  • Ensure that all services, automatic dialing equipment, or other types of equipment recognize the new 369 area code as a valid area code and continue to store or program telephone numbers as 10-digit numbers. Some examples are: stored telephone numbers in contact lists in wireless phones, PBXs, fax machines, Internet dial-up numbers, speed dialers, call forwarding settings, voicemail services, medical alert devices, safety alarm security systems and gates, ankle monitors and/or other similar equipment.
  • Check items such as your website, personal and business stationery, printed checks, advertising materials, contact information, and your personal or pet ID tags to ensure the area code is included.

 

What will remain the same?

  • Your telephone number, including the 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.
  • You will continue to dial 1+10 digits for local calls within and between the overlay area codes, and 1+10 digits for long distance calls.
  • You can still dial just three digits to reach 911 and 988, as well as 211, 311, 411, 511, 611, 711 or 811 if those are currently available in your community.

 

Who may you contact with questions?

If you have any questions regarding information provided in this notice, please call T-Mobile USA at 1-877-453-1304 for more information. You can also visit the California Public Utilities Commission website at https://www.cpuc.ca.gov/707areacode


 

Dialing Plan Change Coming to 602 & 623 Area Codes in Arizona All Customers Should Dial 10 Digits Starting February 11, 2023

 

To ensure a continuing supply of telephone numbers in the Phoenix metropolitan area, the Arizona Corporation Commission has approved the elimination of area code boundaries between the 480, 602 and 623 area codes in the Phoenix metro area.

 

What is boundary elimination overlay?

A boundary elimination overlay for the Phoenix metro area means the three area codes serving the Phoenix metro area will all serve the same geographic area, there will no longer be a boundary between the 480, 602 and 623 area codes and the three area codes will all serve the same combined geographic region. A boundary elimination overlay does not require you to change your existing area code or phone number but will require you to include the area code when dialing all calls, including local calls.

 

Who will be affected?

The boundary elimination overlay between 480, 602 and 623 area codes will affect callers in the Phoenix metro area which includes but is not limited to the communities of Avondale, Chandler, Gilbert, Glendale, Mesa, Phoenix, Scottsdale, Sun City, Sun Lakes, Tempe, and Tolleson.

 

When will the change begin?

Beginning February 11, 2023, anyone with a 602 or 623 area code should begin using 10 digits (area code + phone number) when dialing all local calls (Mandatory 10-digit dialing has already been implemented in the 480 area code). This includes all local calls which currently allow 7-digit dialing. During the permissive 10-digit dialing period, if you forget and only dial 7 digits, your calls will still complete. The permissive 10-digit dialing period will remain in place until August 12, 2023.

Beginning August 12, 2023, 10-digit dialing will become mandatory for anyone with a 602 and 623 area code, and their calls that do not include the area code will not complete. If you forget and only dial 7 digits, you will hear a recorded message that advises you to include the area code, and you will need to hang up and re-dial your call including the area code.

 

What will you need to do?

In addition to dialing 10-digits for all local calls, you should identify your telephone number as a 10-digit number (area code + 7-digit telephone number), and include the area code when giving the number to friends, family, business associates, and customers, etc. Please ensure all services, such as automatic dialing equipment, or other types of equipment that are programmed to dial a 7-digit number are updated to include the area code. Some examples are life safety systems and medical monitoring devices, PBXs, fax machines, Internet dial-up numbers, alarm and security systems, gates, speed dialers, mobile and cordless phone contact lists, call forwarding settings, voicemail services, and similar functions. Be sure to check your personal and business stationery, checks, advertising materials, websites, and your personal or pet ID tags to ensure the area code is included in your telephone number.

 

What will remain the same?

  • Your telephone number, including the current area code, will not change.
  • What is currently a local call will remain a local call regardless of the number of digits dialed.
  • The price of a call or other rates and services will not change.
  • You will continue to dial 1+ area code + telephone number for all long-distance calls.
  • You can still dial just three digits to reach 911 and 988, as well as 211, 311, 411, 511, 611, 711, or 811, if currently available in your community.

 

Who may you contact with questions?

If you have any questions regarding information provided in this notice, please call T-Mobile USA at 1-877-453-1304 or the following web site for more information: https://www.azcc.gov/utilities/telephone/all-about-area-codes


 

NOTICE
NEW AREA CODE TO BE ADDED TO THE 530 AREA CODE

 

The California Public Utilities Commission (CPUC) will begin the process to introduce a new area code to the area now served by the 530 area code, as the 530 area code is expected to be depleted of phone numbers by September 2025. Pending approval by the CPUC, the new area code will be introduced on top of the 530 area code using the overlay method.

The CPUC has made available a recorded webcast to inform the public about the overlay. Topics to be discussed in the recorded webcast include: (1) History of the 530 area code; (2) Area code relief process; (3) Overlay relief method; (4) Effects of the pending overlay; and (5) Implementation periods. The recorded webcast will be available to view and download at https://www.cpuc.ca.gov/AreaCodes/ beginning January 6, 2023. Comments about the information presented in the webcast may be submitted to the CPUC Public Advisor's Office by email at public.advisor@cpuc.ca.gov, or by postal mail to 320 W. 4th Street, Suite 500, Los Angeles, CA 90013 by March 6, 2023.


 

The New 363 Area Code is Coming to the New York 516 Area Code Region 

 

To ensure a continuing supply of new telephone numbers, the New York Public Service Commission has approved an all-services area code overlay for the 516 area code region. The 516 area code comprises the entirety of Nassau County on the western portion of Long Island including the cities of Long Beach and Glen Cove, the Towns of Hempstead, North Hempstead, and Oyster Bay, and various villages within the Towns. The new 363 area code will serve the same geographic area currently served by the existing 516 area code.

 

What is an Area Code Overlay?

An overlay is the addition of another area code (363) to the same geographic region as an existing area code region (516). The overlay does not require you to change your existing area code or phone number, or how you dial your calls. You will continue to dial the area code and phone number for all local calls, as you do today, within and between the 516 and new 363 area codes.

 

Who is affected and when does the new 350 area code become effective?

Beginning January 20, 2023, customers in the 516 area code overlay region may be assigned a number in the new 363 area code when they request new service or an additional line. Customers receiving a 363 area code will be required to dial the area code and phone number for all local calls, just as customers with telephone numbers from the 516 area code do today.

 

What will you need to do?

Customers in the overlay region should:

  • Continue to dial 10 digits for all local calls, including calls within the same area code.
  • Continue to identify your telephone number as a 10-digit number, and include the area code when giving the number to friends, family, business associates, customers, etc.
  • Ensure that all services, automatic dialing equipment, or other types of equipment recognize the new 363 area code as a valid area code and continue to store or program telephone numbers as 10-digit numbers. Some examples are: stored telephone numbers in contact lists in wireless phones, PBXs, fax machines, Internet dial-up numbers, speed dialers, call forwarding settings, voicemail services, medical alert devices, safety alarm security systems and gates, ankle monitors and or other similar equipment.
  • Check items such as your website, personal and business stationery and printed checks, advertising materials, contact information, and your personal or pet ID tags to ensure the area code is included.

 

What 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.
  • You will continue to dial 10 digits for local calls within and between the overlay area codes, and 1+10 digits for long distance calls.
  • You can still dial just three digits to reach 911, as well as 211, 311, 411, 511, 611, 711, 811, or 988 if those are currently available in your community.

 

Who may you contact with questions?

If you have any questions regarding information provided in this notice, please call T-Mobile USA at 1-877-453-1304 for more information. You can also visit the New York Public Service Commission website at https://www.dps.ny.gov/.


 

NOTICE

NEW AREA CODE TO BE ADDED TO THE 213/323 AREA CODE REGION

 

The California Public Utilities Commission (CPUC) will begin the process to introduce a new area code to the 213/323 area codes, as the supply of available phone numbers in the 213/323 area code region is expected to be depleted by June 2025. Pending approval by the CPUC, the new area code will be introduced on top of the 213/323 area code region.

 

The 213/323 area code region was formed in 2017 when the 323 area code underwent an overlay that eliminated the boundary between the 213 area code region and the neighboring 323 area code region. The resulting combined 213/323 region is thus served by both the 213 and the 323 area codes. The new area code, if approved by the CPUC, will be the third area code for the region.

 

The CPUC has made available a recorded webcast to inform the public about the new area code. Topics to be discussed in the recorded webcast include: (1) History of the 213/323 area code; (2) Area code relief process; (3) Overlay relief method; (4) Effects of the pending overlay; and (5) Implementation periods. The recorded webcast will be available at https://www.cpuc.ca.gov/AreaCodes/ beginning November 18, 2022. Comments about the addition of the new area code may be submitted to the CPUC Public Advisor's Office by e-mail at public.advisor@cpuc.ca.gov, or by postal mail to 505 Van Ness Ave., San Francisco, CA 94102 by January 18, 2023. A copy of the webcast presentation slides may be requested by contacting the CPUC Public Advisor's Office by email at public.advisor@cpuc.ca.gov, or by phone at (866)849-8390.


 

The New 350 Area Code is Coming to the California 209 Area Code Region

 

To ensure a continuing supply of telephone numbers, the California Public Utilities Commission has approved an all-services overlay for the 209 area code region. The 209 area code serves all or portions of Alameda, Alpine, Amador, Calaveras, Eldorado, Fresno, Madera, Mariposa, Merced, Sacramento, San Joaquin, Stanislaus, and Tuolumne counties, and encompasses cities such as Angels Camp, Atwater, Ceres, Dos Palos, Escalon, Galt, Gustine, Hughson, Ione, Lathrop, Livingston, Lodi, Los Banos, Manteca, Merced, Modesto, Newman, Oakdale, Patterson, Plymouth, Ripon, Riverbank, Sonora, Stockton, Tracy, Turlock, and Waterford. The 209 area code also covers Yosemite National Park and Kirkwood Mountain Resort. The new 350 area code will serve the same geographic area currently served by the 209 area code.

 

What is an Area Code Overlay?

An overlay is the addition of another area code (350) to the same geographic region as an existing area code (209). The overlay does not require you to change your existing area code or phone number, or how you dial your calls. You will continue to dial 1+10 digits (area code + phone number) for all local calls, as you do today, within and between the 209 and 350 area codes. Mobile phone customers will continue to dial either 10 digits or 1+10 digits.

 

Who is affected and when does the new 350 area code become effective?

Beginning November 28, 2022, customers in the 209 area code region may be assigned a number in the new 350 area code when they request new service or an additional line. Customers receiving the 350 area code will be required to dial the 1+10 digits for all local calls, just as customers with telephone numbers from the 209 area code do today. Mobile phone customers receiving 350 numbers may dial either 10 digits or 1+10 digits.

 

What will you need to do?

Customers in the overlay region should:

  • Continue to dial 1+10 digits for all local calls, including calls within the same area code.
  • Continue to identify your telephone number as a 10-digit number, and include the area code when giving the number to friends, family, business associates, customers, etc.
  • Ensure that all services, automatic dialing equipment, or other types of equipment recognize the new 350 area code as a valid area code and continue to store or program telephone numbers as 10-digit numbers. Some examples are: stored telephone numbers in contact lists in wireless phones, PBXs, fax machines, Internet dial-up numbers, speed dialers, call forwarding settings, voicemail services, medical alert devices, safety alarm security systems and gates, ankle monitors and/or other similar equipment.
  • Check items such as your website, personal and business stationery, printed checks, advertising materials, contact information, and your personal or pet ID tags to ensure the area code is included.

 

What will remain the same?

  • Your telephone number, including the 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.
  • You will continue to dial 1+10 digits for local calls within and between the overlay area codes, and 1+10 digits for long distance calls.
  • You can still dial just three digits to reach 911 and 988, as well as 211, 311, 411, 511, 611, 711, or 811 if those are currently available in your community.

 

Who may you contact with questions?

If you have any questions regarding information provided in this notice, please call T-Mobile USA at 1-877-453-1304 or access https://www.t-mobile.com/customers/area-code-splits-overlays for more information. You can also visit the California Public Utilities Commission website at https://www.cpuc.ca.gov/209areacode