How to secure my phone

[Android Question]

Hello, I have an android phone (Samsung S3) and I need something surprising when someone lifts it from my desk to spy on me. My mum checks on my personal emails and calls (I am over 20!) and it really annoys me a lot. Is there something that can make a real noise or notify me at least?

Thanks very much in advance,

Bea

 

[MLSS]

You could put a pin lock or password lock on it. Then no one could access your phone unless they had the pin or password.

You can look under lock screen options in settings.