You must mean Pre-Fill and not (Progressive) Profil(ing).
Both work on mobile on Marketo LPs, in any case, but are quite different features.
You'll have to specify what you mean by "mobile" as in OS and browser and supply your URL.
Thanks sorry for my delay. You are correct Pre-fill. and when I tested it on my iPhone it worked but my boss's iPhone it did not. Obviously you are right the browser should make a difference, but I just want to make sure Pre-fill works in a general sense out of the box as it were.