Anecdotal (counter)evidence: in India, Reliance ("Jio") has been offering free (which is a first) 4G (I believe only one other carrier offers that) data for a few months now, ending March of this year. (I believe they're using this to both draw users and give people a taste of what a fast mobile data connection can be like as well as to work out teething problems. Nobody's a saint, etc.)