This has been my main music player app for the past 2 years. What I love about it is the offline nature of the app for security reasons and the queues feature.
In the Doctor Who episode The Fires of Pompeii, the romans in pompeii constructed a digital computer using blue prints given to be them by some aliens and doctor who destroyed it.
The $50 smart phone may have 3g internet capability but do the networks in sub saharan africa have reliable 3g coverage. For me in my part of africa the answer is no.
We already have a lot of those in nigeria and also in other african countries. These charging shops are a necessary convenience and they provide jobs for the youths.