Yeah it's not mobile friendly what so ever right now. There's way to much data on the screen, and probably way too much data usage in it's current state for it to be useful.
I do want to make it mobile friendly in the future, but right now I'd highly recommend at least a tablet, on wifi :)
I think a lot of people look at steem on phones. You should focus here for your next ap. None of the steem aps are focused on phone screens so there is a real Opty there. What are you working on next?