I agree entirely. I also think that for most of those people from poor countries who are using two (or even more) SIMs, if/when their countries collectively get wealthier (with better infrastructure and a real choice of operators), they'll stop using multiple SIMs because they'll no longer have a need for them. The cultural entrenchment of dual SIM cards in Nigeria (and possibly elsewhere as well) mentioned in Zeta's article can only last for so long.