The aim of the study was to explore the effects of different input devices on task performance for smartphone operating. Thirty young subjects were recruited to participate for the experiment as paid volunteers. Independent variables of the experiment were input device (finger, stylus, touch glove, and touch ring), target size (3, 5, 10 mm) and movement distance (30, 60, 90 mm). Dependent variables were average click time, click error and individual preference. The results of average click time for different devices from the shortest to the longest time were finger (0.59 sec), stylus (0.61 sec), touch ring (0.69 sec), and touch glove (0.85 sec). Tapping operating with stylus input obtained the least click error (7.35%), and the followed devices in sequence were touch ring (9.79%), finger (18.07%), and touch glove (43.62%) which gained the largest errors. Average click time increased when movement distance increased and target size fixed, however, click error did not showed this trend. Both average click time and click error increased when target size decreased. The individual preference of input devices for operating (from the most to the least) was stylus, finger, touch ring, and touch glove. This study suggests that stylus could be the best selection for smartphone tapping operation and touch glove would only be used in some conditions that the gloves are needed to be worn due to work demands or cold weather.