Lots of people in developing countries have access to cheap Android smart phones but no computer these days. Fortunately that's all you need to use Bitcoin.
Only with a thin client, defeating the purpose of Bitcoin. The Blockchain is currently over 18 GB, more storage than any cheap phone I've ever seen, and takes days to download.
Even Satoshi said it is likely most people will use lightweight clients. Even the original paper describes how to make a lightweight wallet that don't need the full history.
