Area code 423
Get a 423 phone number
To get a 423 phone number, pick an available 423 number below and sign up for AvoCall. Your new number works for calls and texts on the phone you already own over WiFi or data. Current web pricing is verified at checkout. No second SIM and no new device are required.
- Location
- Chattanooga, TN, Tennessee
- Time zone
- Eastern & Central
The 423 area code covers Chattanooga, TN and nearby Tennessee communities.
Top 20 423 numbers available right now
Pulled live from our carrier network. Last updated: August 26, 2026 at 8:50 PM UTC.
Every number requires an AvoCall plan. Current web pricing is verified at checkout, and number availability changes often.
About the 423 area code
Since 1995, area code 423 has connected Chattanooga, Tennessee with Johnson City, Kingsport, Bristol, and Cleveland. Its territory spans two clocks, with some communities on Eastern time and others on Central.
The code was formed from area code 615. It went on to supply the ground for 865, and it now pairs with 729 as an overlay, putting its local calls at ten digits.
Dialing note: 423 is part of an overlay complex with 729, so local calls in this area are dialed with all ten digits.
Numbering details on this page (service dates and overlay status) are checked against the NANPA numbering registry. Registry data as of 07/16/2026.
423 phone number FAQ
- How do I get a 423 phone number?
- Pick an available 423 number and sign up for AvoCall. Your new Chattanooga, TN number works for calls and texts on your existing phone over WiFi or data. Current web pricing is verified at checkout. There is no second SIM and no new device.
- Where is the 423 area code?
- It serves Chattanooga, TN and nearby cities in Tennessee, including Chattanooga, Johnson City, Kingsport.
- Can I receive verification codes on a 423 number?
- AvoCall 423 numbers support calling and messaging. Verification-text compatibility varies by sender; short-code and 2FA delivery is not guaranteed.