All Android. Most lower cost devices like Moto G. These small, dusty, scratched up devices hold the key to the entire world for these folks. We have to figure out how to ensure a great experience on these phones, even if there is bad network, low memory and small battery life.
And I thought my job was hard…
Punit Soni

Well said, these core UX challenges are the difference between dormant and active users as well as keeping the momentum of new users coming.