Button 4 (Mail) with the wdzkfnma.kez password gets you to some kind of GSM Network Test, accessible IMHO by a remote wired connection in laboratory conditions.

• 按键4（录音）组合wdzkfnma.；kez 密码文件，会进入某种GSM网络测试模式，在实验室的数据线连接环境中，可以连接IMHO。