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'''<span lang="en">Short</span> codes''', or '''short numbers''', are short digit sequences, significantly shorter than [[telephone number]]s, that are used to address messages in the [[Multimedia Messaging System]] (MMS) and [[short message service]] (SMS) systems of [[mobile network operator]]s.<ref>{{Cite web |title=What is an SMS Short Code? {{!}} Twilio |url=https://www.twilio.com/docs/glossary/what-is-a-short-code?utm_source=docs&utm_medium=social&utm_campaign=guides_tags |access-date=2023-03-08 |website=www.twilio.com |language=en}}</ref> In addition to messaging, they may be used in [[abbreviated dialing]].
Short codes are designed to be easier to read and remember than telephone numbers. Short codes are unique to each operator at the technological level. Even so, providers generally have agreements to avoid overlaps. In some countries, such as the United States, some classes of numbers are inter-operator (used by multiple providers or carriers, U.S. inter-operator numbers are called '''common short codes''').<ref>{{cite web | url=http://www.youra.com/stats/mobileuse.pdf | title=Common Short Codes: Cracking The Mobile Marketing Code | access-date=2022-12-27 | last=Neufeld |first=Evan |url-status=dead |archive-url=https://web.archive.org/web/20140114064327/http://www.youra.com/stats/mobileuse.pdf |archive-date=2014-01-14 }}</ref>
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