About Nightblast
Nightblast sends urgent alerts to selected contacts using encrypted SMS messages. Two Nightblast users first exchange encryption keys; after that, one can compose an alert and send it to the other. The receiving phone displays an alert and vibrates, with an optional loud sound played through the alarm audio channel. Vibration-only mode is also available. The app is designed for situations where an alert should be hard to miss. Whether a sound can be heard during Do Not Disturb depends on the recipient’s alarm settings and volume. Sending and pairing use SMS rather than an internet service, and the product information notes that connecting devices and sending alerts can consume multiple SMS messages. Nightblast requires compatible recipients who have exchanged keys, and the sender should confirm that the recipient’s device can receive and display the alert. SMS availability and possible carrier charges or message limits depend on the user’s mobile plan. The supplied description does not explain emergency-service integration; it is a contact-to-contact alert tool.
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