Samsung Galaxy S4 Customer Consultant Manual page 92

Part 2 > Q126: Making a voice call when device locked
Q : When using the Car Kit via Bluetooth, I can't make a voice call using a
What should I do ?
A : Sorry for your inconvenience.
If you change the "Call" setting > "Even when device locked", you can also call using a Car Kit
although the Galaxy S4 is locked.
* To enable the above feature, follow the steps below :
Apps → Settings → (My device) Call → Call accessories → Outgoing call conditions → Even when device locked
Car Kit when the is device locked.
92