IPhone screen popped put but still working?

I dropped my iphone 4s and the screen cracked and little bits started to chip of around the home button and pretty much the whole area above the screen but now its completely popping out on the left side, but its still works (except for sound camera and vibration but anyway).Is it dangerous to use it like this (i'm using it now)? I haven't had it for a year yet and I'm with Telstra, will they fix it under warranty?

You should get it fixed and should not use it because bits of glass can easily cut you, ask apple or your provider if you have a warranty on your phone. You can also find people on Craigslist or eBay to do it for you. The last thing you can do is buy a front and back of an iPhone 4S (Any color you want) and replace it yourself by watching a tutorial on YouTube.