Lol just because you cant buy mcoin though sms it doesnt mean you cant buy, actually its the last service to buying anything i would use to buy anything, first the price is too expensive, second theres so many bugs in this service thats not worth using it.
I recomend anyone who want to buy mcoin or anything though internet to do though credit card, its the cheapest way, if you don't have a international CC, ask a parent to let you use, if they dont let and you are bellow 18 you could just make a pre-paid card they work very likely pre-paid phones, you add the money and use.