In this paper, we suggest that we can use our mobile devices as an effective interface for HMD-based augmented reality (AR) applications. These days most of us can possibly send short message with our mobile phones and watch the movies on our PDAs. Personal hand-held devices are well customized that they deserve to be familiar interfaces for interaction with AR applications. We can also add more interaction metaphors as mobile devices are designed to be programmable and extensible for some extra modules. Furthermore, the display panel of mobile devices makes a good marker which is changeable to variable features on user’s demand. Categories and Subject Descriptors H.5.2 [Information Interfaces and Presentation]: User Interfaces – Input devices and strategies. General Terms Design, Reliability, Human Factors Keywords Mobile phone, PDA, mobile device, Augmented Reality, interface.