Some states require 10-digit dialing for all outgoing calls. If you make calls from one of these states, you must include the area code in addition to the 7-digit phone number for call to succeed.

To avoid problems, you may want to update the contacts in your address book and any stored phone numbers for services such as call forwarding, call screening, and call blocking.

Please note that for some area codes this feature will vary depending on the ISP. As of March 2018, Verizon and Cox have announced that all calls now require 10 digits and that they will no longer support 7 digit dialing on any of their networks. 

Note: Most 3-digits numbers, such as 911 and 411, don’t require an area code.

10 Digit Dialing works as follows:

- For calls within your local calling area you will need to dial Area code + 7 digit number.

- For calls outside of your local calling area you will need to dial 1 + Area code + 7 digit number.

Though if you choose to use the second option for all calls, they will proceed as normal without issue.

States and area codes that require 10-digit dialing
Alabama 205, 256, 938
California 213, 310, 323, 408, 415, 424, 442, 510, 530, 619, 628, 657, 669, 714, 747, 760, 805, 818, 858, 916
Colorado 303, 720, 
Connecticut 203, 475, 860, 959
Florida 305, 321, 407, 754, 786, 954
Georgia 404, 470, 678, 706, 762, 770
Idaho 208, 986
Illinois 224, 312, 331, 630, 773, 779, 815, 847, 872
Indiana 317, 812, 930
Kentucky 270, 364
Maryland 240, 301, 410, 443, 667
Massachusetts 351, 508, 617, 774, 781, 857, 978
Michigan 248, 947
Mississippi 601, 769
Nebraska 402, 531
Nevada 702, 725
New Jersey 201, 551, 609, 732, 848, 862, 973
New York 212, 315, 347, 518, 607, 631, 646, 718, 917, 929, 934
North Carolina 336, 704, 743, 919, 980, 984
Ohio 220, 234, 330, 380, 419, 567, 614, 740
Oklahoma 539, 918
Oregon 458, 503, 541, 971
Pennsylvania 215, 267, 272, 412, 484, 570, 610, 717, 724, 878
Philadelphia 445
Puerto Rico 787, 939
South Carolina 843, 854
Tennessee 615, 629
Texas 210, 214, 281, 346, 430, 469, 512, 682, 713, 726, 737, 817,  832, 903, 972
Utah 385, 801
Virginia 434, 571, 703
Washington 206, 253, 360, 425
West Virginia 304, 681
Wisconsin 534, 715

Toll-Free area codes
800
844
855
866
877
888