I was going through my apps to clear the cache and noticed that my talk back (I think that's what it's called) is missing, it's a pre-installed app. My phone is a free phone and they don't offer much room so I have to clear the cache several times a day. I only have 1 app I installed but how do I get the app back? I looked in the play store but I can't find it. Help, I don't know exactly what this app is for.