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A typical mobile phone number is written as 01M-XXX YYYY or 01M-XXXYYYY. Toll-free and local charge numbers are written as 1-800-XX-YYYY and 1-300-XX-YYYY respectively, while premium rate numbers are written as 600-XX-YYYY.
Any new number will follow the numbering plan. Mobile phones use geographic area codes (two digits): after that, all numbers assigned to mobile service have nine digits, starting with 6, 7, 8 or 9 (example: 55 15 99999–9999). 90 is not possible, because collect calls start with this number.
Country calling codes, country dial-in codes, international subscriber dialing (ISD) codes, or most commonly, telephone country codes are telephone number prefixes for reaching telephone subscribers in foreign countries or areas via international telecommunication networks.
The 3GPP standards for mobile networks provide a BCD-encoded field of ten bytes for the telephone number ("Dialling Number/SCC String"). The international call prefix or "+" is not counted as it encodes a value in a separate byte (TON/NPI - type of number / numbering plan identification).
A telephone prefix is the first set of digits after the country, and area codes of a telephone number. In the North American Numbering Plan countries (country code 1), it is the first three digits of a seven-digit local phone number, the second three digits of the 3-3-4 scheme.
All telephone numbers in Mexico have ten digits, of which the first identifies one of the eight principal geographic regions of the country. The national number is formed by prefixing the previously existing local number format with an area code. [2] All ten digits must be dialed for all calls.
Telephone numbers are of variable length. Local numbers are supported from landlines. Numbers can be dialled with a '0'-lead prefix that denotes either a geographical region or another service. Mobile phone numbers have distinct prefixes that are not geographic, and are portable between providers.
The E.164 recommendation provides the telephone number structure and functionality for five categories of telephone numbers used in international public telecommunication. For each of the categories, it details the components of the numbering structure and the digit analysis required for successful routing of calls.
Using the format specified by the International Telecommunication Union (ITU) in Recommendation E.164 for telephone numbers, a Canadian number is written as +1NPANXXXXXX, with no spaces, hyphens, or other characters; e.g. +12505550199.
Vietnam 's country code is +84. There are many area codes for landlines, as well as a separate format for mobile phone numbers. The five emergency phone numbers are 111 ( child protection ), 112 (lifesaving services), 113 ( police ), 114 (fire), and 115 (first aid).