I would consider defining the BlackBerry requirement immediately. Yes, I see the image, but why wouldn't I think you're just using that as a default phone imag

I would consider defining the BlackBerry requirement immediately. Yes, I see the image, but why wouldn't I think you're just using that as a default phone image? You're risking high frustration if they don't catch the supported platforms note. As far MVP, if it works and you can start exploring product/market fit with rapid iterations (add more lean buzzwords here)...then of course!