Floating Trust Badges are designed to be displayed on desktops and tablets only. They will not be displayed on mobile phones because their screen size is small. The Floating Trust Badge will occupy too much space on such a small screen and it will create an unpleasant experience for visitors of your website.
If you still would like to display Floating Trust Badges on mobile phones, it is possible to do so by adding a custom CSS snippet to your WordPress theme (Appearance > Customize > Additional CSS).
@media (max-width: 767px) {
body #cr_floatingtrustbadge,
body #cr_floatingtrustbadge.cr-floatingbadge-big {
display: block;
}
}