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This paper presents a detailed study on the first read rate (FRR) of seven 2D-barcodes currently used for camera phone applications. The study revealed a few surprising observations. Through our analysis, we identified three key factors to improve the robustness of 2D-barcode reading, the range of the reading distance and the stability of the readers. This will contribute to the widespread use of 2D-barcode mobile technology as a ubiquitous computing tool.