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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.
Country codes are defined by the International Telecommunication Union (ITU) in ITU-T standards E.123 and E.164. The prefixes enable international direct dialing (IDD). Country codes constitute the international telephone numbering plan. They are used only when dialing a telephone number in a country or world region other than the caller's.
This format includes the recommendation of prefixing international telephone numbers with a plus sign and using only spaces for digit grouping. The presentation of a telephone number with the plus sign indicates that the number should be dialed with an international calling prefix, in place of the plus sign. The number is presented starting the ...
Microsoft canonical address format for telephone numbers [2] [3] derives from E.123 international notation by allowing explicit indication of area code with parentheses. The canonical format is used by the Telephony API (TAPI) , a Windows programming interface for dial-up fax, modem, and telephone equipment.
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.
They must be dialed with 7 digits from any phone (in the country. The number format is 444 XX XX. To dial call center numbers from other countries, the number must be dialed as country code + call center number like 90 444 XX XX. If you dial a call center number with the area code an IVR says you must not use the area code. Dialing procedure:
This is a discussion of telephone numbers in the Kingdom of Saudi Arabia. The country's calling code is +966. In addition to a numbering plan, there are also dedicated numbers or number formats for Internet services, toll-free numbers, and public or emergency services.
Telephone numbers in Malta are regulated by the Malta Communications Authority (MCA), the national regulatory authority for the telecommunications sector in Malta. [2] The numbering plan for Malta adheres to the E.164 international numbering standard , allowing communication both domestically and internationally.