A mobile terminal and an operating method thereof are provided. The optical film according to the subject invention can effectively enhance the brightness of a liquid crystal display and reduce the optical interference. The compositions preferably have a structured lipid content of between about 92 and about 96 weight percent and a phytosterol ester content of between about 4 and about 8 weight percent, based on the total weight of the health and nutrition promoting composition. Slits are embodied between adjacent metal pipes. The height adjusting mechanism can also serve as one headrest falloff preventing mechanism, so the height adjusting mechanism can lock and unlock the headrest. When the configuration file is received, the IP phone is provisioned according to the configuration profile.