sentences:  FCC's regulation of the CNMI as "domestic" has no legal effect for telephone carriers outside the United States, for whom the CNMI is often not a competitive destination.Therefore, calls from other countries inbound to the CNMI can still be relatively expensive, especially compared to outbound calls from the CNMI since the CNMI has access to most U.S. toll-free numbers.Within the islands, only the seven-digit phone number is necessary.