I'm open to the idea, but SMS typically cost 35%-50% of the purchase price, so of the $30 purchase, $10.50-$15 would go to the company that handled the transaction.
PayPal & Google take $0.30 + about 3% of the purchase. So for a $29 purchase that's about $1.17 total, much less.
Is SMS the only way you can pay?
Does Money Booker not work?
What are the other main payment services in Europe?