Haha, this is the digital version of the Indian phenomenon of &#x27;missed calls&#x27;, used as 1-bit 0-cost notification mechanism. It&#x27;s become such a cultural artifact, that big companies are now advertising numbers you can &#x27;missed call&#x27; and get a callback from.<p><a href="https:&#x2F;&#x2F;gigaom.com&#x2F;2011&#x2F;12&#x2F;13&#x2F;indias-missed-call-mobile-ecosystem-2&#x2F;" rel="nofollow">https:&#x2F;&#x2F;gigaom.com&#x2F;2011&#x2F;12&#x2F;13&#x2F;indias-missed-call-mobile-ecos...</a>