在拨号界面输入类似*#06#一样的暗码,会进入到一个app里面,在android L之前,该代码是在packages/services/Telephony/src/com/android/phone/SpecialCharSequenceMgr.java
android L将代码改到了packages/apps/Dialer/src/com/android/dialer/SpecialCharSequenceMgr.java
packages/services/Telephony/src/com/android/phone/SpecialCharSequenceMgr.java