It's not "richer countries", unless none exist in Europe or Asia. SMS has only kept its primacy for text communication in North America. Also note the RoW has never had to pay to receive SMS.
But NB even where messaging apps are defacto norms, most of the confirmation and verification for businesses remains via SMS.
But NB even where messaging apps are defacto norms, most of the confirmation and verification for businesses remains via SMS.