Messenger app Deleted itself?

So my messenger app deleted itself from my iPhone 6 and so I tried to redownload it but it won't, I've restarted my phone multiple times but nothing works any ideas

What is the error you are getting when you try to redownload it?

  • What's a messenger app that can send videos? I made some videos on my iphone and i need to send them to myself(On an ipad) I don't want to use imessage, and i know kik can't take videos, and it's takes a wicked long time to send them on email. Is there any 'messaging' apps that can send video?
  • My whatsapp data deleted itself on my iPhone? I was using my iPhone 4 normally and was using whatsapp daily. Today in the evening when i opened my whatsapp it start saying restore from icloud. How? And all the data is deleted itself. Now i have a very pervious backup. Now how to bring all the data back of so many days. My chats and photos were there in it. My icloud backup was also turned off. IIm disappionted from this thing. How to recover all this. I need a big help.
  • My iPhone 4s' brightness is turning itself low by itself? - 1 How do I fix this? Is it a bug? I have the iOS 6.1.3 installed. I did drop it in water like 2 weeks ago but I made sure all the water came out, my step mom dropped her phone in the toilet like a year ago and till this day it works perfectly fine! So why is mine having problems?
  • IPhone more code instant messenger app? Is there any more code messenger app in the App Store? It would be cool to chat using it. All the apps I saw are to teach mors code but non to use it so far. My friend and I both have iPhones please inform me if you know an existing instant messenger using morse code or anything similar that's awesome.