Passengers who are in transit often do not have the one New Taiwan dollar coins needed to use a public phone. Now, they need only press a yellow button and dial "100" to get the international operator, or "108" for the domestic long distance operator. They may then place their long distance collect call.
為考慮過境旅客未備一元硬幣，將電話機上加裝黃色按鈕，發話人只要按下黃色按鈕，不必投幣，即可撥叫「一○○」號國際台掛發國際電話受話人付費通話，亦可撥叫「一○八」號長途台掛發國內長途電話受話人付費通話。