sms alerts won't work, most people turn there cell phones off at night, some older or handicap people don't use cell phones, the only systems i know that would work is direct phone calls to all land lines and cell phones using natural language, that can not only deliver the message but also listen to who need help (in the case where the call tells them to leave the home but they need help to leave) look at the Simptel alert system it can find cell phones in a region getting the numbers from the cell phone towers and speak 44 different languages, which would help a tourist from another country
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sms alerts won't work, most people turn there cell phones off at night, some older or handicap people don't use cell phones, the only systems i know that would work is direct phone calls to all land lines and cell phones using natural language, that can not only deliver the message but also listen to who need help (in the case where the call tells them to leave the home but they need help to leave) look at the Simptel alert system it can find cell phones in a region getting the numbers from the cell phone towers and speak 44 different languages, which would help a tourist from another country