How does Call Alert work on iPhone?
The Call Alert feature sends a loud audio tone with optional text to your contact. The tone will repeat every minute until the person responds or clears the alert. To send a call alert after selecting the contact you want, tap the Call Alert button (the bell icon to the right of the talk button), enter the text and tap Send. You can also just tap Send and a default message of "Zello me!" will be sent.
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