Fact Check: Does Area Code 423 Change Your Phone Number or Raise Calling Rates?
By Sophia Al-Mansoor
To prevent sudden service disruptions, state regulators and regional telecommunications providers scheduled a phased transition. Rather than forcing a disruptive split, which would have sliced counties in half and assigned half the population a completely new number, the state opted for an area code overlay.
| Phase / Regulatory Step | Implementation Window | Operational Impact on Users |
|---|---|---|
| Permissive Dialing Period | Early 2025, Mid 2025 | Callers could dial either 7 digits or 10 digits; automated network warnings reminded users of coming changes. |
| Mandatory 10-Digit Dialing | Enforced August 5, 2025 | Calls placed with only 7 digits fail to connect; automated intercepts require callers to hang up and redial. |
| Overlay Code Activation | 2025, 2026 Rollout Window | New phone lines receive the new regional overlay code; all existing 423 numbers remain active and unchanged. |
Mandatory compliance went live on August 5, 2025. Seven-digit attempts now trigger an automated operator message reminding callers to hang up and include the area code. While mobile phones smoothly adjusted through address book updates, analog infrastructure faced immediate friction.
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