Kim,
I've implemented extra code in the smartphone edition which will "simulate" a mulitpress-input for this key. Every time you press it, it will toggle the last character of the current grid input box in a sequence from , . - > : etc.
The sequence is started, when a blank or the # char is entered into the bg grid.
Which character do you get on pressing this key on your phone?

@All: I've fixed the mmol/l labels on the BG-Grid and also the persistant saving of the settings checkboxes.
I will mail a link for this version when we've found out about the extra chars since maybe I have to detect another char for your phone
