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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{{cn|date=December 2023}} to be easier to read and remember than telephone numbers.<ref name=":0">{{Cite web |title=Short Code - What Is It, How Should You Use It? {{!}} CM.com Glossary |url= https://www.cm.com/en-za/glossary/short-code/ |access-date= 2023-03-08 |website= CM.com |language=en-ZA}}</ref> 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>
Organisations may set up short codes to encourage users to engage with services such as [[Mobile donating |charity donations]], mobile services, ordering [[ringtones]], or television-program voting.<ref name=":0" /> Messages sent to a short code can be billed at a higher rate than a standard SMS and may even subscribe a customer to a recurring monthly service that will be added to the customer's mobile-phone bill until the user texts, for example, the word "STOP" to terminate the service.{{citation needed|date=June 2016}}
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