The population of Cote d'Ivoire is 20 million, Orange have released data from 5 million customers nationwide and they are one of 6 mobile phone operators. That suggests that mobile penetration is quite high in Cote d'Ivoire. Go to Abidjan and you'd see empirical evidence to support this theory too.

Cote d'Ivoire is a comparatively prosperous country in West Africa.

Welcome to the 21st century. Cell phones are a dirt-cheap commodity, not a luxury.

If you can't afford a second-hand feature phone, you likely can't afford to ride the bus.

I read yesterday that more people in India have access to a cell phone than to a toilet or running water. I assume they are very poor since they have to poop outside on the street, but they do have cell phones.