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The Italian enclave San Marino has its own country code 378, but landline numbers can be reached using the Italian country code as well: the prefix "0549" is assigned to San Marino. Dialing either "+378 xxxxxx" or "+39 0549 xxxxxx" will reach the same number. Mobile phone customers are sometimes assigned Italian phone numbers.
As existing numbers began to run out, the three mobile phone operators were assigned numbers in 014 code distinguished by the first digit of the seven-digit subscriber number. With the proliferation of new mobile virtual network operators and the exhaustion of existing codes, two new ranges 011 and 015 are made available for assignment.
Total number portability exists in Chile, [2] so users can freely move from one service provider to another without losing their number, regardless of connection technology, whether land-line, mobile or VoIP. Therefore, a number beginning with "8" or "9" no longer denotes that it is a mobile phone number.
Telephone numbers listed in 1920 in New York City having three-letter exchange prefixes. In the United States, the most-populous cities, such as New York City, Philadelphia, Boston, and Chicago, initially implemented dial service with telephone numbers consisting of three letters and four digits (3L-4N) according to a system developed by W. G. Blauvelt of AT&T in 1917. [1]
The total length of all phone numbers (area code and the phone number) is constant at 10 digits. For example, the number 7513200000 signifies the area code 751 (the area code for Gwalior) followed by the phone number. Fixed-line or landline numbers are at most 8 digits long.
After the breakup of the Soviet Union, the country used an open numbering plan, having a varying number of digits.Local telecommunications regulators had planned to abandon this system by 2009, but postponed the changeover until 2010, [3] later pushed once more until 2012 [4] and finally approved for implementation in the period of 2020–2025.
The first digit also shows if a particular subscriber number is operated by BTC or another operator. The area codes are always cited with the trunk code. When dialing all subscriber numbers must be prefixed with trunk and area code except short codes (see below). Numbers starting with 700, 800 and 90x as well as mobile ones are prefixed by '0 ...
Worldwide distribution of country calling codes. Regions are coloured by first digit. 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.