Font too small for mobile device

The font is too small when using a mobile device. I have it set to use the largest font possible but its still only shows up as 10. This is the largest! Not good as our work environment needs to be 11–12 font.
Desktop font is adjustable. But who sits at a desk using IM anymore?

AOLneedsHelp about AIM: Chat, Text, Photo Share, Voice Message, v7.3.5