Replace phone prefix

phone-prefix

// Phone links
    if (navigator.userAgent.match (/iPhone/i)) {
    var a = document.getElementsByTagName ("a");
    for (var i = 0; i < a.length; i++) {
      if (a[i].getAttribute ('href').search (/callto:/i) === 0) {
        a[i].setAttribute ('href', a[i].getAttribute ('href').replace (/^callto:/, "tel:"));
      }
    }
  }