This applet uses SMS service. You will send an SMS to the IFTTT server with the tag "#lost" and then a VoIP call will come to your phone or tab that is lost.
If
Send IFTTT an SMS tagged
Send IFTTT a tagged SMS by adding a hashtag symbol anywhere in the message (e.g. #IFTTT).
Then
Call my device
This action will call your device with the IFTTT app installed and speak a message provided by your Applet.
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