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TL;DR Before smartphones, apps and easy access to Internet in India, SMS and calls did cost a lot of money. To lower the barriers for response to billboard ads
by punnerud 6y ago
TL;DR
Before smartphones, apps and easy access to Internet in India, SMS and calls did cost a lot of money. To lower the barriers for response to billboard ads customer would call a hotline, the phone would ring twice and automatically disconnect, and the system would reply within seconds with dynamic content, through a call or texts.