Google Play Carrier Billing

http://www.vodacom.co.za/vodacom/services/internet/pay-with-google-play

http://www.vodacom.co.za/vodacom/terms/googleplay

https://secure.telkom.co.za/today/carrierbilling/google/

Who plays mobile games?

https://medium.com/googleplaydev/who-plays-mobile-games-8b33f76bb6d8
https://en.wikipedia.org/wiki/Gamer