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A '''vertical service code''' or '''VSC''' is a special [[telephone number]] that usually begins with the '''*''' (star) key on the [[touch tone]] keypad.
Vertical service codes are often colloquially referred to as "Star" codes, [[calling feature]] codes, or "CLASS" codes after the AT&T trademark for the original implementation of these codes, known as "Custom Local Area Signalling Service
==List of vertical service codes==
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