Pre-6.0 Android permissions aren&#x27;t granular and are &#x27;take it or leave it&#x27; approved at first install. Some apps install services that run at startup. This would make for a rather excellent monetizatation&#x2F;interactivity strategy for a chat app, which already has all the necessary permissions for &#x27;normal&#x27; operation (think Snapchat LIVE or Moments).<p>Sonic networking in action:
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[2] <a href="https:&#x2F;&#x2F;gigaom.com&#x2F;2014&#x2F;06&#x2F;26&#x2F;chromecast-will-use-ultrasonic-sounds-to-pair-your-tv-with-your-friends-phones&#x2F;" rel="nofollow">https:&#x2F;&#x2F;gigaom.com&#x2F;2014&#x2F;06&#x2F;26&#x2F;chromecast-will-use-ultrasonic...</a>