Mobile phone was invented to ease communication. However, its usage it is argued has led to addiction. This study aims to explore mobile phone addiction among the generation Y (Gen Y) in Malaysia, by focusing how technology, social network, physiology and psychology become the risk factors. A survey method was employed to gather data from 280 respondents. Factor analysis, reliability test and the structural equation modelling were performed. The results show internal consistency and the correlations between all the determinants and addiction. The findings also revealed that the physiological factor is the most important risk leading to addiction problems with mobile phone (ß=0.63, p<0.01). However, the technological factor did not predict for the mobile phone addiction (ß=-0.008, p>0.05).