SonicMessengerTM uses a patented ultrasound communication technology that emits encoded text messages into inaudible acoustical tones and decodes the incoming sonic tone back into a custom text messages, coupons, links to websites or videos and much more.
https://andro.io/app/sonicmsgr
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Android app profile
SonicMessenger for Android – Latest Version & Features
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> 2.2k
Monthly Downloads
~$900
Estimated Cost
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