修改文件
frameworks/base/telephony/java/android/telephony/CarrierConfigManager.java
static {
sDefaults = new PersistableBundle();
sDefaults.putString(KEY_CARRIER_CONFIG_VERSION_STRING, "");
sDefaults.putBoolean(KEY_ALLOW_HOLD_IN_IMS_CALL_BOOL, true);
sDefaults.putBoolean(KEY_CARRIER_ALLOW_DEFLECT_IMS_CALL_BOOL, false);
sDefaults.putBoolean(KEY_ALWAYS_PLAY_REMOTE_HOLD_TONE_BOOL, false);
sDefaults.putBoolean(KEY_AUTO_RETRY_FAILED_WIFI_EMERGENCY_CALL, false);
sDefaults.putBoolean(KEY_ADDITIONAL_CALL_SETTING_BOOL, true);
sDefaults.putBoolean(KEY_ALLOW_EMERGENCY_NUMBERS_IN_CALL_LOG_BOOL, true);//modify