If you have set up on your Samsung Galaxy S5 the call forwarding, then we will tell you here how to deactivate it again on Android Lollipop:
Open from the home screen of the Samsung Galaxy S5 the menu and then the settings. Scroll all the way down to the "Applications" section and tap there at the button "Call". In the next menu, tap now on "Additional Settings".
Now the data for call forwarding which is saved by your provider is received. After that, tap on "Call forwarding" --> "Voice Call".
You can now see all forward possibilities offered by your provider. Now deactivate the corresponding call forwarding by tapping on it and selecting "Turn off". Finished!
You now know how to disable a set Call forwarding on the Samsung Galaxy S5 with Android lollipop.