HI!

unfortunately, there are no icons in this set of icons. Try using these, maybe you will like something:

.top-area-contacts .gem-contacts-phone:before {
    content: '\e407' !important;
}
.top-area-contacts .gem-contacts-phone:before {
    content: '\e507' !important;
}
or
content: '\e631';
or
content: '\e627';