"What's the smartphone penetration in…?" is a question that keeps coming up in our day-to-day work. Google's Consumer Barometer has the answer for at least 47 countries.
The data isn't "internet fresh" as it was collected between January and March in 2014 but it's the most authoritative source for now.
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Consumer Barometer itself has tons of data on how people around the world use the internet - from device ownership to social media usage, from online research and purchasing to online video.
You can build and export your own graphs, download the raw data etc. It's a real treasure trove for anyone building and advertising online and mobile solutions, or using online as an advertising channel.