[Galaxy Note 4 Android Development (Snapdragon)] linqdesires:
this is not the final solution but if you know what you're doing can you try to switch between radio modes using an app like https://play.google.com/store/apps/details?id=com.kliksob.forgswitch

is your sim card coming back?

if not, click on the update button in the 4g switcher app

my portion of modem log

03-11 18:47:25.960 D/SubscriptionInfoUpdater( 1137): [Receiver]+
03-11 18:47:25.960 D/SubscriptionInfoUpdater( 1137): Action: android.intent.action.SIM_STATE_CHANGED
03-11 18:47:25.960 D/SubscriptionInfoUpdater( 1137): slotIndex: 0
03-11 18:47:25.960 D/SubscriptionInfoUpdater( 1137): simStatus: LOADED
03-11 18:47:25.960 D/SubscriptionInfoUpdater( 1137): Ignoring simStatus: LOADED
03-11 18:47:25.960 D/SubscriptionInfoUpdater( 1137): [Receiver]-
03-11 18:47:25.961 E/use-Rlog/RLOG-RIL-QMI( 454): qmuxd: TX message on fd=14, to qmux_client_id=0x6, len=54
03-11 18:47:25.962 E/use-Rlog/RLOG-RIL-QMI( 454): qmuxd: TX message on fd=14, to qmux_client_id=0x6, len=54
03-11 18:47:25.972 E/CarrierActionAgent( 1137): [0]Unsupported action: 7
03-11 18:47:25.972 D/CarrierActionAgent( 1137): [0]EVENT_SIM_STATE_CHANGED status: LOADED
03-11 18:47:25.974 D/CarrierSignalAgent( 1137): [0]Sending signal com.android.internal.telephony.CARRIER_SIGNAL_RESET to the carrier signal receiver: ComponentInfo{com.android.carrierdefaultapp/com.android.carrierdefaultapp.CarrierDefaultBroadcastReceiver}
03-11 18:47:25.992 D/GsmCdmaPhone( 1137): mBroadcastReceiver: action android.telephony.action.CARRIER_CONFIG_CHANGED
03-11 18:47:25.996 D/CarrierSignalAgent( 1137): [0]CarrierSignalAgent receiver action: android.telephony.action.CARRIER_CONFIG_CHANGED
03-11 18:47:25.998 D/CarrierSignalAgent( 1137): [0]Loading carrier config: carrier_app_wake_signal_config
03-11 18:47:25.998 D/CarrierSignalAgent( 1137): [0]Loading carrier config: carrier_app_no_wake_signal_config
03-11 18:47:26.000 I/ImsManager( 1137): Creating ImsService using ServiceManager
03-11 18:47:26.005 D/ImsManager( 1137): updateVolteFeatureValue: available = false, enabled = true, nonTTY = true
03-11 18:47:26.005 I/ImsManager( 1137): Creating ImsService using ServiceManager
03-11 18:47:26.005 E/ImsManager( 1137): updateImsServiceConfigForSlot:
03-11 18:47:26.005 E/ImsManager( 1137): com.android.ims.ImsException: getConfigInterface()
03-11 18:47:26.005 E/ImsManager( 1137):	at com.android.ims.ImsManager.getConfigInterface(ImsManager.java:1915)
03-11 18:47:26.005 E/ImsManager( 1137):	at com.android.ims.ImsManager.updateVolteFeatureValue(ImsManager.java:1399)
03-11 18:47:26.005 E/ImsManager( 1137):	at com.android.ims.ImsManager.updateImsServiceConfigForSlot(ImsManager.java:1359)
03-11 18:47:26.005 E/ImsManager( 1137):	at com.android.internal.telephony.GsmCdmaPhone.handleMessage(GsmCdmaPhone.java:2217)
03-11 18:47:26.005 E/ImsManager( 1137):	at android.os.Handler.dispatchMessage(Handler.java:106)
03-11 18:47:26.005 E/ImsManager( 1137):	at android.os.Looper.loop(Looper.java:164)
03-11 18:47:26.005 E/ImsManager( 1137):	at android.app.ActivityThread.main(ActivityThread.java:6494)
03-11 18:47:26.005 E/ImsManager( 1137):	at java.lang.reflect.Method.invoke(Native Method)
03-11 18:47:26.005 E/ImsManager( 1137):	at com.android.internal.os.RuntimeInit$MethodAndArgsCaller.run(RuntimeInit.java:440)
03-11 18:47:26.005 E/ImsManager( 1137):	at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:807)
03-11 18:47:26.005 E/ImsManager( 1137): Caused by: android.os.RemoteException: ImsServiceProxy is not available for that feature.
03-11 18:47:26.005 E/ImsManager( 1137):	at android.telephony.ims.ImsServiceProxyCompat.checkBinderConnection(ImsServiceProxyCompat.java:180)
03-11 18:47:26.005 E/ImsManager( 1137):	at android.telephony.ims.ImsServiceProxyCompat.getConfigInterface(ImsServiceProxyCompat.java:125)
03-11 18:47:26.005 E/ImsManager( 1137):	at com.android.ims.ImsManager.getConfigInterface(ImsManager.java:1908)
03-11 18:47:26.005 E/ImsManager( 1137):	... 9 more
03-11 18:47:26.007 D/GsmCdmaPhone( 1137): [GsmCdmaPhone] broadcastEmergencyCallStateChanges = false
03-11 18:47:26.007 E/GsmCdmaPhone( 1137): [GsmCdmaPhone] Invalid cdma_roaming_mode settings: -1
03-11 18:47:26.007 D/EriManager( 1137): loadEriFileFromXml: check for alternate file
03-11 18:47:26.007 D/EriManager( 1137): loadEriFileFromXml: no alternate file