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E.164 is an international standard ( ITU-T Recommendation), titled The international public telecommunication numbering plan, that defines a numbering plan for the worldwide public switched telephone network (PSTN) and some other data networks . E.164 defines a general format for international telephone numbers.
E.123. E.123 is an international standard by the Telecommunication Standardization Sector of the International Telecommunication Union ( ITU-T ), entitled Notation for national and international telephone numbers, e-mail addresses and Web addresses. [1] It provides guidelines for the presentation of telephone numbers, email addresses, and web ...
07 Mobile phone services; 08 Special phone numbers: Freephone (numéro vert) and shared-cost services. 09 Non-geographic number (used by Voice over IP services) All geographic numbers are dialed in the ten-digit format, even for local calls. The international access code is the International Telecommunication Union's recommended 00. [1]
Call 051-212-3456 within Busan: 212-3456. Call 051-212-3456 from elsewhere: 051-212-3456. Call 02-312-3456 from abroad: +82-2-312-3456. South Korea uses an open dialing plan with a total length (including 0) of 9 to 11 digits and, within city, subscriber numbers 7 to 8 digits long. Dialing from mobile phones to any type of phone except 010 ...
074 – Pager. 075 – Mobile phone " Natel D" ( Swisscom) / previously used for Liechtenstein ( Telephone numbers in Liechtenstein) which used to be within the Swiss telephone numbering plan. 076 – Mobile phone Sunrise. 077 – Mobile phone " Natel C". 078 – Mobile phone Salt ( Orange (telecommunications))
The International Telecommunication Union (ITU) publishes a recommendation entitled Notation for national and international telephone numbers, e-mail addresses and Web addresses. Recommendation E.123 specifies the format of telephone numbers assigned to telephones and similar communication endpoints in national telephone numbering plans.
A telephone keypad using the ITU E.161 standard. A telephone keypad is a keypad installed on a push-button telephone or similar telecommunication device for dialing a telephone number. It was standardized when the dual-tone multi-frequency signaling (DTMF) system was developed in the Bell System in the United States in the 1960s – this ...
• Fake email addresses - Malicious actors sometimes send from email addresses made to look like an official email address but in fact is missing a letter(s), misspelled, replaces a letter with a lookalike number (e.g. “O” and “0”), or originates from free email services that would not be used for official communications.