After some more testing I can see that we do scroll *some* tables like http://en.m.wikipedia.org/wiki/Comparison_of_smartphones#section_1 but the one above continues to not be scrollable

Fixed in https://gerrit.wikimedia.org/r/7680

Although this is fixed on modern mobile devices horizontal scrolling doesn't work in older Androids and iphones

This could be an interesting technique to explore for those devices:
http://css-tricks.com/examples/ResponsiveTables/responsive.php

Turns out I was being stupid
You *can* scroll on iphone - you just have two use two fingers (in emulator I can simulate this by holding shift and alt )