I was particularly looking for an app where I can lock my applications, my SMS/text app, in partuclar. I came across Lockdown on Cydia, which does exactlty.

My concern: is it safe to install on your iphone? latest version is 5.0+ i beleive. I have heard it messes up your phone. Has anyone used it and would you recommend it?

Also, is there any other app if this is not safe for Iphone?