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It is common to write phone numbers as (0xx) yyy-yyyy, where xx is the area code. The 0 prefix is for long-distance dialing from within the country. International callers should dial +93 xx yyyyyyy. Area codes for common cities are: 093 xx yyyyyyy: Afghanistan; 020 yyy yyyy: Kabul; 026 yyy yyyy: Daykundi; 030 yyy yyyy: Kandahar
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Paging services 64 x 000 64 x xxx xxx Carrier Selection Code 10xx 10xxx UTR VSAT, Tekstofon, Fixed SMS 802 xxx xxx UAN (universal number) 804 xxx xxx VPN 806 xxx xxx VCC 808 xxx xxx VoIP 39x xxx xxx NDSI – dialed access to data networks incl. Internet 20 xx xx
Twitter verification is a system intended to communicate the authenticity of a Twitter account. [1] Since November 2022, Twitter users whose accounts are at least 90 days old and have a verified phone number receive verification upon subscribing to X Premium or Verified Organizations; this status persists as long as the subscription remains active.
National (significant) number: 10 Digits. Area code: 3 digits; Local subscriber's number: 7 digits. Only exception in this is the call center numbers which start with 444, the call center numbers cannot be dialed with area code, they must be dialed with 7 digit from any phone (Landlines & Mobiles) in the country. The number format is 444 XX XX.
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.
The principal means of validating a resident registration number is to use an algorithm to check the last digit against what it should be based upon the rest of the digits entered (i.e. checksum verification) however this only ensures it is a valid number but does not authenticate the user.
The Luhn algorithm or Luhn formula, also known as the "modulus 10" or "mod 10" algorithm, named after its creator, IBM scientist Hans Peter Luhn, is a simple check digit formula used to validate a variety of identification numbers.