<style>
.tn-atom .t-input-group_ph{
display:none;
}
</style>
<script>
$(document).on('change','input[name="smscheck"]',function(e){
if( $('input[name="smscheck"]').is(':checked') ){
$('.tn-atom .t-input-group_ph').slideDown(300);
}else{
$('.tn-atom .t-input-group_ph').slideUp(300);
};
});
</script>