A telephone numbering plan is a type of numbering scheme used in telecommunication to assign telephone numbers to subscriber telephones or other telephony endpoints. Telephone numbers are the addresses of participants in a telephone network, reachable by a system of destination code routing. Telephone numbering plans are defined in each of the administrative regions of the public switched telephone network (PSTN) and in private telephone networks.
In the United Kingdom, telephone numbers are administered by the Office of Communications (Ofcom). For this purpose, Ofcom established a telephone numbering plan, known as the National Telephone Numbering Plan, which is the system for assigning telephone numbers to subscriber stations.
Telephone numbers in the People's Republic of China are administered according to the Telecommunications Network Numbering Plan of China. The structure of telephone numbers for landlines and mobile service is different. Landline telephone numbers have area codes, whereas mobile numbers do not. In major cities, landline numbers consist of a two-digit area code followed by an eight-digit local number. In other places, landline numbers consist of a three-digit area code followed by a seven- or eight-digit local number. Mobile phone numbers consist of eleven digits.
Telephone numbers in Indonesia have different systems for land lines and mobile phones: land lines use area codes, while mobile phones do not.
The following telephone numbers in Chile are geographic area codes for all national and international calls terminating in Chile.
Telephone numbers in Nigeria use an open numbering plan. They are composed of a combination of an area code and a local line or subscriber telephone number. Area codes consist of one digit or two digits. Local telephone numbers contain from five to seven digits, and may vary within the area code. Mobile phone numbers start with 070, 080 or 081, 090 or 091 and are followed by eight digits.
Telephone numbers in Luxembourg employ a closed dialling system, whereby all numbers are dialed in the same format whether from within Luxembourg or from abroad. There is no trunk prefix like "0".
Portugal changed to a closed telephone numbering plan on 31 October 1999; previously, the trunk prefix was '0', but this was dropped.
Telephone numbers in Bulgaria are under a full number dialing plan, meaning that the full national number must be dialed for all calls, while it retains the trunk code, '0', for all national dialling. Area codes are prefixed with a trunk code of 0 only when dialled domestically.
Telephone numbers in Israel consist of an area code and a subscriber number. The dial plan type in Israel is closed, and "0" is the internal trunk prefix in Israel. Israel's country calling code is +972.
The following are the telephone codes in Tanzania.
This is an alphabetical list by town of phone dialing codes in Croatia. The country calling code for Croatia is +385. Croatia received a new country code following the breakup of the SFR Yugoslavia (+38) in 1991.
Telephone numbers in Iceland are seven digits long and generally written in the form xxx xxxx or xxx-xxxx and the E.123 format specifies +354 xxx xxxx from abroad since the country code is +354.
National conventions for writing telephone numbers vary by country. 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.
The following are the telephone codes in Comoros.
The following are the telephone codes in Ethiopia.
The following are the telephone codes in The Gambia.
The following are the telephone codes in São Tomé and Príncipe.
Before the civil war in 1991, very few people had access to the government-controlled fixed-line telephony that only operated in a few areas. Following the fall of the central government, the telecommunication industry fell into the hands of private investors and telephone numbering remained unregulated. Following its re-establishment in 2012, the Federal Government the government recognized the need to establish regulatory frameworks to ensure effective oversight and development of the telecommunication sector, and in 2017, the government enacted the National Communications Authority which is tasked to regulate and oversee the telecommunications industry.
