[Enable phone number clicks on mobile only] #css

index.html

<a href=”tel:00000000000″>0000-00-0000</a>

style.css

@media(min-width: 678px) {
  a[href^="tel:"] {
    pointer-events: none;
    cursor: default;
    text-decoration: none;
  }
}

// Bootstrap
@include media-breakpoint-up(md) {
  a[href^="tel:"] {
    pointer-events: none;
    cursor: default;
    text-decoration: none;
  }
}