Fred Vogelstein:

Here’s the math: I think we can all agree that Apple is selling iPhones at a rate of 4 million a month. Add the 1 million iPads/month Apple is selling and another 1.85 million/month as a guestimate for iPod Touch sales and you get … wait for it …  6.85 million iOS devices a month, or 42 percent more than Android. Apple doesn’t consistently provide iPod Touch numbers, but over the years it has provided enough data to make an educated guess.

I don’t disagree with the math here, but I do disagree with the iPad being in this category. I would say you need to include the iPod touch, but that the iPad should be considered a portable computer not a phone, likewise for any Android tablets (like the monstrous new Dell Phone/Tablet).