An enlightened idea.
Indonesia has changed its telecommunications laws to ensure that the nation's mobile carriers pay for SMS messages sent to rivals. Indonesia's current regime is a “sender keeps all” arrangement whereby a mobile subscriber's carrier charges for a TXT, but the recipient's carrier (if different) doesn't get a single rupee. The …
Fee is a bit high
But if everything's balanced it's a zero sum game.
Unfortunately the scammers will simply move to offshore SMS gateways, as Mblox did when UK/Channel Island telcos refused to provide service anymore.