Phone Formats (JS) - http://codepen.io/sdrew/details/jAXWbV

phone_format_mx.js

var PhoneFormatMX = function (phone, display) {
  var prefix = '';
  var dash = 0;
  var segment = 4;

  phone = phone.replace(/\D/g, '');
  dash = phone.length;

  if (dash > 10) {
    if (phone.indexOf('044') === 0 || phone.indexOf('045') === 0) {
      prefix = phone.substr(0, 3);
      phone = phone.slice(3);
    } else if (phone.indexOf('00') === 0 || phone.indexOf('01') === 0) {
      prefix = phone.substr(0, 2);
      phone = phone.slice(2);
    }

    dash = phone.length;
  }

  while (dash > segment) {
    phone = phone.slice(0, dash - segment) + '-' + phone.slice(dash - segment);
    dash = phone.indexOf('-');

    if (segment === 4 && (prefix.length > 0 || (prefix.length === 0 && phone.length === 11))) {
      if (phone.indexOf('55') !== 0 && phone.indexOf('33') !== 0 && phone.indexOf('81') !== 0) {
        segment = 3;
      }
    }
  }

  dash = phone.indexOf('-');
  if (dash >= 0 && phone.match(/[-]/g).length > 1) {
    if (display) {
      phone = '(' + phone.slice(0, dash) + ') ' + phone.slice(dash + 1);
    }
    if (prefix.length === 0) {
      prefix = '+'
    } else {
      prefix += display ? ' ' : '-';
    }
  }

  return prefix + phone;
}