How to Bring Back the Menu Key on Galaxy S5
Samsung decided to change the functionality of Galaxy S5's 3 touch buttons and Menu Key is no longer one of the options, as "Showing Recent Apps" ...
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Follow these steps to setup SIM Card Lock on Android devices, like Samsung Galaxy Series and other devices:
1. Open "Setting" App
2. Go to "Security"
3. Tap on "Set up SIM Card Lock"
4. Make sure the "Lock SIM card" is marked. (You need to know your SIM PIN to use this feature. On some SIMs the PIN is 0000 by default)