That *is* interesting.
There's at least one article somewhere about cell phone use among those in poverty (because I've seen it). If one were to visit young people in extreme poverty (I have), one would see that almost all of them have a cell phone, which, in the US, is taken as a sign of not-really-in-poverty.
But they do have actual economic benefits (in the article, knowing what/where the best prices for goods are, since small business is key).