Currently for those areas in the mainland without international direct dial service (ISD), users can first call the C & W special number, which will relay the call to the mainland.
目前大陸尚未開放國際電話用戶直接撥號（ISD）的地區，用戶可先以國際撥號方式，撥叫香港大東局專設的電話號碼，再由大東局值機員紀錄後轉接大陸。