The document discusses the adoption of mobile phones versus solar power in Africa. It notes that mobile phone adoption increased rapidly after the introduction of prepaid mobile plans, while solar power adoption was slower. It then proposes a new "Solar as a Service" model enabled by mobile networks that could provide affordable solar power with no upfront costs or risks for customers, allowing them to access over 50 times more light for less money than kerosene. This new pay-as-you-go solar power solution could help address Africa's priority of better home lighting and be delivered through an automated software and distribution system leveraging local small businesses and transportation.