How to lock my phone?

Question by lessthanthree: How to lock my phone?
My phone is a Samsung Genoa C3510. I’ve been having privacy issues with my phone lately, my friend’s are peeking on what’s in it. Is there anyway to lock it after you “unlocked” the touch screen? Like can you put a code so not even the wallpaper will be seen unless you inputed the correct code/pin. Please help, I’ve tried everything but nothing works.
10 points for the most detailed answer.

Best answer:

Answer by Sara new account
Watch 1:40 to end:
Shows how to lock. 2:47 Phone is locked. 🙂
Good luck!

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