How to prevent others from tampering with your smartphone?

[neku]

Often if other people are in the house, they may tamper with your smartphone or other gadgets, especially when they are kept for charging. How to ensure that no one tampers with the gadgets when you are not in the room?

 

[eLdavis]

If it's your personal room, you can choose to lock your room door. Or you could simply set a password on your gadgets.