- 08/07/10 – Start of Permissive 10-Digit Dialing
- 10/01/10 – Earliest Date to Order Central Office Codes in New 539 NPA
- 03/05/11 – End of Permissive Dialing and Start of Mandatory 10-Digit Dialing
- 04/01/11 – Earliest New NPA Central Office Code Activation date; and, Effective Date of the New 539 NPA
Although subscribers may use either seven- or 10-digit dialing for local calls within the overlay area during the permissive dialing period, 10-digit dialing is encouraged. Additionally, when preparing for overlay area code relief, carriers are strongly encouraged to prepare their switches to begin sending 10-digits prior to the mandatory 10-digit dialing conversion date for customers.
The dialing for both 918 and 539 NPAs will be as follows:
~ Local Home NPA (HNPA) or Foreign NPA (FNPA) Call … 10-Digits (NPA-NXX-XXXX)
~ Toll HPNA or FNPA Call … 1+ 10-Digits (1+ NPA-NXX-XXXX)
~ Operator Services HNPA or FNPA Call … 0+ 10-Digits (0+ NPA-NXX-XXXX)
International and domestic carriers should ensure network-wide activation of the new 539 NPA prior to 4/1/11. Verification of proper routing may be tested from 1/4/11 through 5/2/11 by dialing 539-539-1539. For additional information, visit www.nanpa.com.
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