<div class="visible-xs-block">
//do a custom loop through products to build the rows/columns for the phone
</div>

<div class="visible-sm-block">
//do a custom loop through products to build the rows/columns for tablets
</div>

<div class="visible-md-block visible-lg-block">
//do a custom loop through products to build the rows/columns for stuff bigger than a tablet
</div>