2 thumbs here, but that comes from my BlackBerry days. I even use the BlackBerry on screen keyboard on my android phones. Currently a One Plus 3, BUT I have owned a 6P (and some other Nexus phones). However I have heard from plenty that prefer one handed typing, the iPhone even has a special feature that allows you to bring down the top half of the screen for easier one handed navigation. You double tap, NOT press the home button and the top half of your iPhone (or iPad, or iWhatever) comes down to the bottom.