The company that handles the system for the state, FirstCall, say just 57 cell phone users have signed up for the service in Delaware.
FirstCall says it will unveil a Web site next week that will allow people to sign up multiple phone numbers, and elect to receive text messages and e-mails in case of an emergency.
The state has only used the reverse 911 system once, after a chemical spill near Dover in 2006. To register a cell phone through First Call, dial (866) 484-3264.
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Information from: WBOC-TV, http://www.wboc.com/