gets the value of the serialnumber property . concode_field_sep ProductInstance.InstanceRange instanceRange concode_elem_sep String serialNumber concode_elem_sep String startingSerialNumber concode_elem_sep XMLGregorianCalendar expirationTime concode_elem_sep String endingSerialNumber concode_elem_sep String imei concode_elem_sep List<String> description concode_elem_sep long serialVersionUID concode_elem_sep String sku concode_field_sep void setIMEI concode_elem_sep void setSerialNumber concode_elem_sep void setExpirationTime concode_elem_sep void setStartingSerialNumber concode_elem_sep void setInstanceRange concode_elem_sep ProductInstance.InstanceRange getInstanceRange concode_elem_sep List<String> getDescription concode_elem_sep String getSKU concode_elem_sep XMLGregorianCalendar getExpirationTime concode_elem_sep String getEndingSerialNumber concode_elem_sep String getStartingSerialNumber concode_elem_sep void setSKU concode_elem_sep void setEndingSerialNumber concode_elem_sep String getIMEI
String function ( ) { return serialNumber ; }