Here is a solution that works to make it more mobile friendly. I will look at adding it to my themes. Just copy, and paste it into your custom css in the admin panel. Of course this is for responsive themes, and not for the Oxwall mobile version.

@media only screen and (min-device-width : 320px) and (max-device-width : 480px){
form[name="contact_form"] .ow_table_1 {
    width: 100% !important;
}
form[name="contact_form"] .clearfix {
    width: 100% !important;
}
}
@media only screen and (min-device-width : 481px) and (max-device-width : 767px) {
form[name="contact_form"] .ow_table_1 {
    width: 100% !important;
}
form[name="contact_form"] .clearfix {
    width: 100% !important;
}
}
@media only screen and (min-device-width : 768px) and (max-device-width : 1024px) {
form[name="contact_form"] .ow_table_1 {
    width: 100% !important;
}
form[name="contact_form"] .clearfix {
    width: 100% !important;
}
}
I added this to my themes with tweaks for sidebar, and no sidebar.