My iphone keeps turning itself off and won't turn back on again?

I have an iphone 4s, i've had it for a year now.recently it will randomly turn itself off even when it has charge in it, it will go off and not turn on for hours. I keep trying to turn it on and eventually it will come up with bit saying it needs to be charged basically.sometimes the screen will go blue or come up with random colours and turn off. I have no insurance for it either.

Added (1). I ordered it online, it's a contract with 3 mobile.i'm not sure if warranty as run out.

Go in to your local Apple store, if you have a receipt of where you purchased your phone, it'll help, but in store they will replace your handset; apples customer service is by far the best I have ever seen.

  • Why is my iPhone 5 turning off and not turning back on? This has happened twice now. My iPhone 5 has turned off in the middle of the night with a full charge and off the charger, and when I try to turn it back on it takes a couple tries. Has anybody experienced this?
  • Siri keeps turning itself off in settings? I installed Siri on my jailbroken iPhone 4 with siridr but whenever I turn on Siri in settings and I go back to it it's off. I'm losing my mind! I can still boot up Siri but it just keeps loading after I say something until I turn it off. Any help is greatly appreciated
  • My iPhone keeps turning on and off like it turns on and off. Can someone tell me? Okay tbms it turns on and off on and off and then sometimes it shows a red screen for a few seconds then off again and dies out. It's not the battery because I got that changed thinking that it was the cause and it wasn't. So is there anything someone can help me with? The repair guy tried restoring it through iTunes he said it didn't work either it just won't come on it doesn't go pass the Apple logo before shutting off and on again and dying out
  • My Iphone 5c keeps crashing and turning off by itself? I have had my Iphone for about 3 months now, I have only dropped my phone once and nothing happened (about a week ago). MY phone has only recently started crashing like every 15 minutes or so, It will turn off by itself, The screen will turn blue or start flashing colors. These colorful vertical lines will show up on my screen and then my screen will slowly fade away.