It can be handy to have a grid layout for very small devided (< 480). This snippit adds "xxs" columns to Bootstrap 3 which solve that purpose

grid.less

// Generate the extra-extra small columns
// These go from a screen width of 0 to (@screen-xs-min - 1), existing below XS.

.make-xxs-column(@columns; @gutter: @grid-gutter-width) {

    min-height:    1px;
    padding-left:  (@gutter / 2);
    padding-right: (@gutter / 2);
    position:      relative;

    @media (max-width: (@screen-xs-min - 1)) {
        float: left;
        width: percentage((@columns / @grid-columns));
    }

}

.make-xxs-column-offset(@columns) {

    @media (max-width: (@screen-xs-min - 1)) {
        margin-left: percentage((@columns / @grid-columns));
    }

}

.make-xxs-column-push(@columns) {

    @media (max-width: (@screen-xs-min - 1)) {
        left: percentage((@columns / @grid-columns));
    }

}

.make-xxs-column-pull(@columns) {

    @media (max-width: (@screen-xs-min - 1)) {
        right: percentage((@columns / @grid-columns));
    }

}

// Override to allow for XXS columns

.make-grid-columns() {

    // Common styles for all sizes of grid columns, widths 1-12
    .col(@index) when (@index = 1) { // initial

        @item: ~".col-xxs-@{index}, col-xs-@{index}, .col-sm-@{index}, .col-md-@{index}, .col-lg-@{index}";
        .col((@index + 1), @item);

    }

    .col(@index, @list) when (@index =< @grid-columns) { // general; "=<" isn't a typo

        @item: ~".col-xxs-@{index}, .col-xs-@{index}, .col-sm-@{index}, .col-md-@{index}, .col-lg-@{index}";
        .col((@index + 1), ~"@{list}, @{item}");

    }

    .col(@index, @list) when (@index > @grid-columns) { // terminal

        @{list} {
            position: relative;
            // Prevent columns from collapsing when empty
            // Inner gutter via padding
            padding-left:  (@grid-gutter-width / 2);
            padding-right: (@grid-gutter-width / 2);
        }

    }

    .col(1); // kickstart it

}

@media (max-width: (@screen-xs-min - 1)) {
    .make-grid(xxs);
}

// Override the `.media-body` width hack.
.col-xxs-12.media-body {
    width: 100%;
}