Teleradiology is the technology of remote medical consultation using X-ray, Computed Tomographic or Magnetic Resonance images. It was commonly accepted by clinicians for its effectiveness of making diagnosis for patients at critical situations. Since the huge size of data volume involved in teleradiology [American College of Radiology et al., 2003], clinicians are not satisfied with the relatively slow data transfer rate. It limits the technology to fixed-line communication between the doctor’s home and his office. In this project, a mobile high speed wireless medical image viewing system using 3G Wireless Network [Collins et al., 2001], Virtual Private Network and One-Time Two-Factor Authentication (OTTFA) technologies is presented. Using this system, teleradiology can be achieved by using a 3G PDA phone to query, retrieve and review the patient’s record at anytime and anywhere in a secure environment. Using this technology, the patient-data availability can be improved significantly, which is crucial to timely diagnosis of patients at critical situations.