Telephony is dead. These days in many places cannot get a job or function without access to email or chat. In a lot of non-rich markets the smartphone is the cheapest option to gain access to these communication systems.
Yeah - although at least according to analytics a lot of western world people also own a computer. In many asian/african areas most of the population only has a smartphone to access the internet.
Much has been written on telephony in the developing world.