I really don't understand the article. So in 2003 cellular minutes were expensive. Fair enough. But then we jump to 2010-2016. No information on pricing of c

I really don't understand the article. So in 2003 cellular minutes were expensive. Fair enough. But then we jump to 2010-2016. No information on pricing of calls then, or more importantly, SMS messages... So a missed-call was free. Okay. But was a single SMS message in 2010-2016 really prohibitively expensive? Because it seems to me that a single SMS number, to which you can send a single SMS with an unlimited number of codes in the body to sign-up for various services, is more efficient than a dedicated phone number for each individual service one might want to sign-up for. And we are also left to assume that incoming SMS and calls were free.