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Clarification "from mobile phones" to distinguish these numbers (e.g. 6xxxx/7xxxx/8xxxx in UK) from Access Codes such as 101/105/111/112/119/159/999, helplines such as 116000/116111/116123, DQ services on 118xxx, Access Codes such as 100/123/155/195 and Access Codes such as 141/1471/1571. |
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=== Hong Kong ===
Codes are four to eight digits in length, start with digits 501-509.<ref>{{Cite web|title=Assignment of Codes for Value-added SMS / MMS|url=https://apps.ofca.gov.hk/apps/CodeAssign/content/code_list.asp|access-date=2021-04-27|website=apps.ofca.gov.hk}}</ref> Emergency number is 992.<ref>{{Cite web| title=992 Emergency SMS - User Guide | url=http://www.police.gov.hk/info/doc/smsemg_e.pdf
=== Hungary ===
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Standard, interoperable short codes in the U.S. are five or six digits long,<ref>{{cite web | url=http://www.usshortcodes.com/csc_press053106.html | title=Common Short Code Administration Announces Open Registration of 6-Digit Codes | publisher=CTIA | work=Press Release | date=2006-05-31}}</ref> never start with 1, and only work in the U.S.<ref>{{Cite web|url=https://usshortcodes.com/faqs|title=Short Code Registry | FAQs|website=usshortcodes.com|access-date=2020-06-02}}</ref> They are leased by the short code program's registry service provider [[iconectiv]], under a deal with the [[Common Short Code Administration]]<ref>{{Cite web|url=http://trademarks.justia.com/784/34/csca-common-short-code-78434150.html|title=CSCA COMMON SHORT CODE ADMINISTRATION Trademark of CTIA - THE WIRELESS ASSOCIATION - Registration Number 3081719 - Serial Number 78434150 :: Justia Trademarks|website=trademarks.justia.com|access-date=2020-06-02}}</ref> and [[Cellular Telecommunications & Internet Association|CTIA]].<ref name="wirelessweek"/> It costs twice as much to choose a specific code as it does to get one that is randomly assigned.<ref name="wirelessweek">{{cite web | url=http://www.wirelessweek.com/news/2007/04/decoding-short-codes | title=Decoding Short Codes | work=WirelessWeek | date=2007-04-15 | author=Alleven, Monica}}</ref> Some carriers assign a subset of their carrier-specific codes to third parties.<ref name="Short1">{{cite web |url=https://www.ctia.org/news/ctia-announced-new-strategic-partner-iconectiv-for-common-short-code-registry-services |title=CTIA Announced New Strategic Partner iconectiv for Common Short Code Registry Services |publisher=[[CTIA – The Wireless Association]] |date=2015-07-30 |access-date=2019-12-22 }}</ref>
<blockquote>"The ''Short Code Registry''<ref>{{Cite web|url=https://usshortcodes.com/|title=Short Code Registry | short code campaigns Customer engagement|website=usshortcodes.com|access-date=2020-06-02}}</ref> maintains a single database of available, reserved and registered short codes. CTIA administers the Common Short Code program, and ''iconectiv''<ref>{{Cite web|url=https://iconectiv.com/|title=Homepage | iconectiv|website=iconectiv.com|access-date=2020-06-02}}</ref> became the official U.S. Short Code Registry service provider in January, 2016. For more information, please see the ''Short Code Registry’s Best Practices''<ref>{{Cite web|url=https://usshortcodes.com/about/BestPractices|title=Short Code Registry | Best Practices short codes marketing campaign|website=usshortcodes.com|access-date=2020-06-02}}</ref> and the ''Short Code Monitoring Handbook''.<ref name="ctia-handbook">{{Cite web | title=RISQ Score {{!}} Your 10DLC Vetting Partner | url=https://www.wmcglobal.com/storage/us_resources/ctia-short-code-monitoring-handbook-current-Short-Code-Monitoring-Handbook-v1.7.pdf
Texting "HELP" to a short code causes the short code service to return a message with terms and conditions, support information — consisting of either a toll-free phone number or email address at a minimum — and other information from the leaseholder of the short code.<ref>{{Cite web|url=http://support.twilio.com/hc/en-us/articles/223134847|title=Industry standards for US Short Code Terms of Service and Privacy policies|website=Twilio Support|access-date=2020-06-02}}</ref><ref>{{Cite web|url=https://www.resolver.com/legal/short-code-terms-of-service/|title=Short Code Terms of Service|access-date=2020-06-02}}</ref><!-- Message Industry standards require that a compliant response is required whenever your recipients text the keyword HELP to your short code, regardless of whether the recipient is subscribed to the program. https://support.twilio.com/hc/en-us/articles/223182208-Industry-standards-for-U-S-short-code-HELP-and-STOP --> A user can opt-out from receiving any further messages from a short code service by texting "STOP", "END", "QUIT", "CANCEL", or "UNSUBSCRIBE" to the short code; after doing so, one final message confirming the opt-out is sent.<ref>{{Cite web|url=http://support.twilio.com/hc/en-us/articles/223182208|title=Industry standards for U.S. short code HELP and STOP|website=Twilio Support|access-date=2020-06-02}}</ref><ref name="ctia-handbook" />
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