Is there a finger print scanner for iphone 4s that unlocks your phone?

I really want to know because i'm tired of my friends getting on my phone because they always figure out my number and my word number

No but there's for the 5s

Nope
hope that helps

No, its hardware which is far different then even the so called fingerprint apps which aren't even remotely the same thing.

No all the apps are fake and it's like a trick your friends thing, the only legit one so far is the new one on the iPhone 5S