Also, quote from linked blog post:
> only 0.05 percent of devices that downloaded apps exclusively from Play contained a PHA.
1. What percentage of Android devices download apps exclusively from Play? They don't say. I, for one, have quite a few not so technical friends who sideload stuff. Also, pretty much all Android devices in Mainland China don't qualify for this criterion, and that's a huge number.
2. Given the track record of malware in Play Store, the number of devices containing a PHA is probably much larger than that of ones containing a known PHA.
> many many devices have never received any security patch to address Stagefright and yet most users aren't affected.
Not sure how you even know that. Not all exploits are visible.