Area Code 423: Cities, Coverage, and Key Information
Explore Tennessee's area code 423, covering the Tri-Cities (Bristol, Johnson City, Kingsport) & Chattanooga. Understand the non-contiguous regions & dialing changes. Key update: mandatory 10-digit dialing starts February 2025 due to the 729 overlay. Learn about the TPUC's role & NANP.
Frequently Asked Questions
What cities are covered by area code 423 in Tennessee?
When will 10-digit dialing become mandatory for area code 423?
Why is area code 423 split into two non-contiguous sections?
What is the new area code being introduced in the 423 region?
How do I dial long-distance calls from area code 423?
What is the role of the TPUC in area code 423?
What should I do to prepare for the 10-digit dialing change in area code 423?
Will my current 423 phone number change with the introduction of the 729 area code?
What happens if I forget to dial 10 digits after the change in area code 423?
Will long-distance rates be affected by the introduction of the 729 area code in the 423 region?
Who do I contact with further questions about the area code changes in 423?
What is the history of area code 423?
What is the area code for Knoxville, TN?
Why is the area code for Knoxville 865?
What cities are in area code 423?
How do I dial local calls in area code 423?
Why is area code 423 split into two sections?
When does 10-digit dialing become mandatory for 423?
What is the new area code overlaying 423?
How to update my contacts for 423 area code change?
What is the area code for Chattanooga, Tennessee?
Why does area code 423 need a new area code?
Will my 423 number change with the new area code?
Who regulates area code 423 in Tennessee?
How do I contact the Tennessee Public Utility Commission?
What happens if I forget to dial 10 digits in 423?
