/**
  * Gets the expected cost category of a short number (however, nothing is implied about its
  * validity). If the country calling code is unique to a region, this method behaves exactly the
  * same as {@link #getExpectedCostForRegion(String, String)}. However, if the country calling
  * code is shared by multiple regions, then it returns the highest cost in the sequence
  * PREMIUM_RATE, UNKNOWN_COST, STANDARD_RATE, TOLL_FREE. The reason for the position of
  * UNKNOWN_COST in this order is that if a number is UNKNOWN_COST in one region but STANDARD_RATE
  * or TOLL_FREE in another, its expected cost cannot be estimated as one of the latter since it
  * might be a PREMIUM_RATE number.
  *
  * For example, if a number is STANDARD_RATE in the US, but TOLL_FREE in Canada, the expected cost
  * returned by this method will be STANDARD_RATE, since the NANPA countries share the same country
  * calling code.
  *
  * Note: If the region from which the number is dialed is known, it is highly preferable to call
  * {@link #getExpectedCostForRegion(String, String)} instead.
  *
  * @param $number PhoneNumber the short number for which we want to know the expected cost category
  * @return int the highest expected cost category of the short number in the region(s) with the given
  *     country calling code
  */
 public function getExpectedCost(PhoneNumber $number)
 {
     $regionCodes = $this->phoneUtil->getRegionCodesForCountryCode($number->getCountryCode());
     if (count($regionCodes) == 0) {
         return ShortNumberCost::UNKNOWN_COST;
     }
     $shortNumber = $this->phoneUtil->getNationalSignificantNumber($number);
     if (count($regionCodes) == 1) {
         return $this->getExpectedCostForRegion($shortNumber, $regionCodes[0]);
     }
     $cost = ShortNumberCost::TOLL_FREE;
     foreach ($regionCodes as $regionCode) {
         $costForRegion = $this->getExpectedCostForRegion($shortNumber, $regionCode);
         switch ($costForRegion) {
             case ShortNumberCost::PREMIUM_RATE:
                 return ShortNumberCost::PREMIUM_RATE;
             case ShortNumberCost::UNKNOWN_COST:
                 $cost = ShortNumberCost::UNKNOWN_COST;
                 break;
             case ShortNumberCost::STANDARD_RATE:
                 if ($cost != ShortNumberCost::UNKNOWN_COST) {
                     $cost = ShortNumberCost::STANDARD_RATE;
                 }
                 break;
             case ShortNumberCost::TOLL_FREE:
                 // Do nothing
                 break;
         }
     }
     return $cost;
 }