7.1新增加功能开关（CarrierConfigManager）
1.默认不插卡紧急号码走ims，设置开关：
// SetKEY_CARRIER_USE_IMS_FIRST_FOR_EMERGENCY_BOOL from true to false
sDefaults.putBoolean(KEY_CARRIER_USE_IMS_FIRST_FOR_EMERGENCY_BOOL,false);
2.关闭data，界面不显示volte视频入口开关：
// SetKEY_IGNORE_DATA_ENABLED_CHANGED_FOR_VIDEO_CALLS from false to true
sDefaults.putBoolean(KEY_IGNORE_DATA_ENABLED_CHANGED_FOR_VIDEO_CALLS,true);
3.volte分析一些关键字：
08-2421:59:50.123 1932 1932 D ImsManager: setAdvanced4GMode:turnOffIms
08-2421:59:50.808 1932 1932 D ImsManager: setAdvanced4GMode:turnOnIms
08-2421:59:25.268 1932 2095 D ImsPhoneCallTracker:[ImsPhoneCallTracker] onFeatureCapabilityChanged: isVolteEnabled=false,isVideoCallEnabled=false, isVowifiEnabled=false, isUtEnabled=false
08-2421:59:27.418 1932 2095 D ImsPhoneCallTracker:[ImsPhoneCallTracker] onFeatureCapabilityChanged: isVolteEnabled=false,isVideoCallEnabled=false, isVowifiEnabled=false, isUtEnabled=true
08-2421:59:50.172 1932 2095 D ImsPhoneCallTracker:[ImsPhoneCallTracker] onFeatureCapabilityChanged: isVolteEnabled=false,isVideoCallEnabled=false, isVowifiEnabled=false, isUtEnabled=true