http://appleinsider.com/articles/13/11/12/idc-data-shows-66-...
And it turns out I misrepresented the fictional statistic. The "real" number is 66%. Though I suppose if you count older mid tier models (this counts sales) still in use, 80% might be pretty close.
IMO you still need to design dow a bit, especially for data poor users. Also smaller screens. In some cases I think craigslist is the thing to emulate.
While I don't normally agree with dismissing something from the source -- in this case Apple Insider -- the way that the article digs to try to generate their manufactured numbers borders on comical. Secondly, the metric that it is "junk" (the article's word) because the ASP is $200+ is asinine, if you will. As is the notion that such makes it a "feature phone" (where ASPs were in the LOW double digits).
A $200 device in many Asian markets is a decidedly premium device. The Xiaomi Redmi, for instance, is a $139 (retail!) decidedly decent mid-range device. In no way does anyone have to design down at all for devices like that, the notion being absurd.
Androids are penetrating markets that were never penetrated by PCs or the web or even residential electricity.
I did, however, say that many of the cheap phones are quite powerful. And they are. And as someone who has several widely deployed games on Android -- one category where there is much more demands than categories like WhatsApp -- it is absolutely no problem at all.
I generally test things on the Nexus One just as a bottom end comparator. Compared to many of the devices from bottom-tier manufacturers now, the Nexus One is grossly underpowered. It is always surprising what it can run with gusto.
Ignoring the fictional statistics, the cheap devices (e.g. Xiaomi) in countries like China still tend to be surprisingly powerful, and you hardly need to design down to them. And it's a rare app, beyond something like video conferencing, that puts any real burden on connectivity.