For certain countries, Twilio offers national phone numbers, which are also sometimes called a non-geographic phone numbers. These are phone numbers in ranges designated to be reachable from an entire country at the same price anywhere in the country as a local phone call. Unlike geographic phone numbers (which are tied to a particular city or region such as Paris or Barcelona), national phone numbers are not tied to a particular local area. As such, geodata for a national number is listed as the country only. Additionally, in some countries, national numbers can only be reached from within the country, although this varies based on the network of the phone provider from which a national number is being dialed.
Your Twilio account is charged for making and receiving phone calls on a national number just as if the it was a local number. For full pricing details throughout the world, see our pricing page.
Placing calls into a national Twilio phone number should be charged by the calling carrier the same way a local call would be charged. However, each carrier around the world is responsible for this pricing, and this could vary based on the pricing of a caller's carrier. To be sure of the charge that will be incurred to call into a Twilio national number, you or your customer should speak with your carrier.
For the most up-to-date list of national numbers offered by Twilio, please go to Numbers and Capabilities Page and look under the column "Types of Numbers Offered" for the word "National."