一、首先要看电话机是否有经邮电部电信政务司批准的入网许可证号,并且要看有效期是否已过。要注意的是,原批准入网、后来又被取消入网的机型,不宜选购。二、电话机外观工艺质量考察:机壳塑料外表光洁,无变形。放在桌面上应平稳,紧固,无松脱;叉簧和各按钮无卡滞现象,显示功能清晰准确。各项功能与说明书相符。三、声音的检查:电话机接通外线后,铃声响亮,发送及接收的声音清晰,无失真、杂音。四、根据自己的实际需要选择电话机的 First, we must look at the phone whether the Ministry of Posts and Telecommunications approved by the Secretary for Telecommunications network license number, and to see whether the validity period has passed. It should be noted that the original approved access to the network, and later canceled network models, should not buy. Second, the appearance of the phone quality of the inspection process: the appearance of plastic casing smooth, no deformation. On the desktop should be smooth, secure, non-loose; hook spring and the button no card stagnation, the display is clear and accurate. The function is consistent with the manual. Third, the sound check: After the telephone connected to the outside line, the ring loud, send and receive the sound clear, no distortion, noise. Fourth, according to their actual need to choose the phone