These 82 area codes (across 35 states) are now required to dial 10 digits for local calls

Seven-digit dialing is out, 10-digit dialing is in.

Starting Sunday, Oct. 24, callers in 82 area codes across 35 states and one U.S. territory will be required to use their three-digit area code before punching in the seven-digit phone number when calling a local number, according to the Federal Communications Commission.

Current phone numbers won't change, but phone calls dialed without the area code after the October deadline won't be connected.

Some area codes use 988 as a local exchange, or the first three numbers in a seven-digit phone number that allow for local calling without the area code. Requiring the three-digit area code for local calls will make way for the National Suicide Prevention Lifeline's new nationwide three-digit phone number, 988. The number will be active by July 16, 2022.

These states and area codes are part of the FCC changes that begin Sunday:

• Alaska: 907

• Alabama: 251

• Arkansas: 501

• Arizona: 480, 520, 928

• California: 209, 530, 562, 626, 650, 707, 925, 949, 951

• Colorado: 719, 970

• Delaware: 302

• Florida: 321 (Brevard County only), 352, 561, 941

• Georgia: 478, 912

• Guam: 671

• Hawaii: 808

• Illinois: 309, 618, 708

• Indiana: 219, 574

• Iowa: 319, 515

• Kansas: 620, 785

• Kentucky: 859

• Louisiana: 337, 504

• Michigan: 616, 810, 906, 989

• Minnesota: 218, 952

• Mississippi: 662

• Missouri: 314, 417, 660, 816

• Montana: 406

• Nevada: 775

• New Hampshire: 603

• New Jersey: 856, 908

• New Mexico: 505, 575

• New York: 516, 607, 716, 845, 914

• North Carolina: 910

• Ohio: 440, 513

• South Dakota: 605

• Tennessee: 731, 865

• Texas: 254, 361, 409, 806, 830, 915, 940

• Vermont: 802

• Virginia: 276, 804

• Washington: 509

• Wisconsin: 262, 414, 608, 920

This article originally appeared on USA TODAY: Dial that area code: FCC requires these places to use on local calls