Starting April 24, Missouri callers will need to dial 10 instead of 7 digits for local calls.
The affected area codes include 314, 417, 660 and 816.
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The change to 10-digit calling is necessary to accommodate the national “988” National Suicide Prevention Lifeline, which takes effect July 2022. Missouri is one of 37 states required to enact 10-digit dialing for select area codes for the change.
Seven-digit dialing will still be completed until the 10-digit dialing becomes mandatory on Oct. 24 to provide adjustment time to the new dialing pattern. Any local calls made in those area codes using seven-digits will not go through after Oct. 24.
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