Rise of using mobile devices has led to different usage areas for these devices. One of them is biometric systems and methods used in mobile devices. They create a remote access model on mobile devices, ensure confidentiality of personal data on mobile devices and these are used in order to personalize and facilitate access security. In this study, biometric systems used in mobile devices, methods and technologies have been investigated. Advantage and disadvantages of them are given. The studies in the literature such as algorithms, technologies, metrics, usage, are investigated for different biometric systems. Mobile face, palm print, iris, voice, fingerprint recognition and studies are evaluated.