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  1. Area codes start with a trunk prefix "0" and extend for up to four digits but usually 3; followed by the local phone number of up to seven digits. In industry jargon, these area codes and prefixes are referred to as NDCs (National Dialing Codes). This is the term used by ComReg and technical documents, as they include non-geographic codes. Historically, like the UK, the term STD code (Subscriber Trunk Dialling) was used.

  2. For certain countries, Twilio offers national phone numbers, which are also sometimes called non-geographic phone numbers. These are phone numbers in ranges designated to be reachable from the 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 ...

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  4. Remember, it varies from location to location. For example, in the US, this is the format you'd use: 1) Dial “011” on your keypad. This is the international access code. 2) Enter the country code next. 3) Dial the city/area code, if applicable. 4) Input the remaining digits of the phone number.

  5. This code specifies that the entire number should be 15 digits or shorter, and begin with an International Call Prefix and a country prefix. For most countries, this is followed by an area code, city code or service number code and the subscriber number, which might consist of the code for a particular telephone exchange. [6]

  6. This code, often digit 0, is also known as a national dialing code or trunk prefix. It is used to dial national calls within a particular country. An example: you are in the US and your friend in Romania gives you this cell number: 07xx xxx xxx. The initial zero is, in this case, the Trunk prefix used to dial calls within Romania and must be left out when dialing to this country from abroad.

  7. E.164 permits a maximum length of 15 digits for the complete international phone number consisting of the country code, the national routing code (area code), and the subscriber number. E.164 does not define regional numbering plans, however, it does provide recommendations for new implementations and uniform representation of all telephone numbers.