Smart portable devices developed rapidly in recent years. Tablets and smartphones are more common for people. The resolution of the camera in these devices is also rising. In particular, after built-in GNSS, gyroscopes, accelerometers and other MEMS sensors, the device is more convenient than general digital cameras. However, the stability of the interior orientation parameters of the built-in camera has to be tested. The position and attitude provided by the built-in sensor, is sufficient as a direct geo-referencing of the shooting images, also yet to be assessed. Therefore, this study will be based on former research results about non-metric digital camera used in close-range photogrammetry. We will design experiments to explore the accuracy of interior and exterior orientation. This study has two issues. First, the interior orientation stability of the portable devices: we will repeat shooting the coded calibration targets by the same model four tablets and by a single tablet. Then we get interior orientation parameters by camera calibration in iWitness Pro. Second, the accuracy of GNSS and gyroscopes in portable devices: We analyze the precision of GNSS and attitude by the same model four tablets, then compared with e-GNSS.