The SIM card, which is used in mobile phones, is the basis upon which telecom companies collect fees. The card itself is a rather well-established identification mechanism, small in size and easy to integrate. Acer and Taiwan Cellular have chosen it as the identification key for the Nankang Park services.
應用在行動電話中的 SIM 卡，是電信公司收費的憑據，本身就是相當成熟的認證機制，再加上體積小、容易整合，被宏和台灣大哥大選來作為園區服務的認證鑰匙。