Early 2000 there was a loop hole on both econet and Netone to change SMS centre number then you can send unlimited international sms to any country. That was before whatsapp, 2G was not even there, there was GPRS only in the western world.
If you want free internet from your sim card its so easy. Make a trip to a mobile recharge card vendor near you, exchange one card with a one american dollar and topup your phone. Volaaa, you are getting internet using your phone