Carriers use short codes with fewer digits for carrier-specific programs - e.g., "Text 611 to see how many minutes you have remaining on your plan." Codes starting with 1 are not permitted. Common short codes in the U.S. are leased by the program's registry service provider iconectiv, under a deal with the Common Short Code Administration and CTIA. Short codes are leased at a price, with a selected code costing twice that of a random code. Some carriers assign a subset of their carrier-specific codes to third parties. U.S. Short codes currently work only in the U.S. "The "Short Code Registry" maintains a single database of available, reserved and registered short codes. CTIA administers the Common Short Code program, and "iconectiv" 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" and the "Short Code Monitoring Handbook"." Texting the word "HELP" to a short code will get a terms and conditions message that contains, a Toll-Free phone number or a support email address, one of these required as a minimum, and other information from the leaseholder of the short code (message and data rates apply). Texting the word "STOP", or "END", or "QUIT", or "CANCEL", or "UNSUBSCRIBE" to a short code will get a response notifying users that they have not been blacklisted and providing details on how to be added to the blacklist if they wish, and that you are unsubscribed and no more messages will be sent.