I am developing my first responsive email based on a (old?) course by Justine and Jason.
My media query is . . .

   /* MOBILE STYLES ------------------------ */

            @@media screen and (max-width:600px) {

                td[class="logo"] img {
                    margin: 0 auto !important; /* trick to center an image */

                table[class="wrapper"] {
                    width: 100% !important;

When I view my emails on my Samsung Galaxy S6, I do not see the mobile styles.
Is the problem that my Samsung Galaxy S6 has 1440 x 2560 ?
Is there a better media query to trigger the mobile styles for today's high res mobile phones?