Area codes required to transition to 10-digit dialing: The FCC states, “There are 82 area codes in 35 states and one U.S. territory that currently use ‘988’ as their local exchange and allow seven-digit dialing. A local exchange, also known as a central office code, is the first three numbers of a seven-digit telephone number. To prepare for implementation of a quick way to dial the National Suicide Prevention Lifeline – using only “988” to connect callers to the Lifeline – these area codes must transition to ten-digit dialing for all calls, including local calls.” The North American Numbering Plan Administrator has a list of the states and area codes that will be affected. You can check the list to find out if your area code is one that will be transitioning: https://nationalnanpa.com/transition_to_10_digit_dialing_for_988/docs/NPAsRequiredtoTransitionto10DD.pdf”