remove from mobile display

Your best bet is to use CSS media-queries to tell set the block containing the breadcrumbs to not display (e.g. display: none;) on the screen sizes you wish to hide them on. There really isn’t a reliable way to do this from the server side, especially since modern websites should be responsive (and use media-queries already).

You may find this helpful in regards to media-queries: https://css-tricks.com/snippets/css/media-queries-for-standard-devices/