Why does my iphone shut down automatically?

I have a iphone 3 and everytime i text play you tube the phone turns off. I have turned all the internet
off to save battery. It is only 16gb and I have loads off apps and maybe it would be worth removing
some as that would help with. Is it the battery maybe it needs replacing or i could need a different charger. When you put in in to charge its on fourty percent wthf. I need my phone for everyday use. Does this happen to any one else?

Could be the battery or the phone may just be old now and have seen too much wear and tear. I'd try removing some clutter in terms of apps, and updating your software OS. If that doesn't work try hard resetting it and changing out the battery at your cell provider store and if that doesn't do it consider a new phone. You can probably still pawn off the iPhone 3 off for $75-100 maybe a little more and put it toward a payment for the new iPhone! People still buy the old broken ones to salvage parts etc. Hope this helps.

  • Why won't my iphone 4s shut down? Everytime I go to turn my Iphone 4s ( Running IOS7 ) off it just boots back up after 1-2 seconds, I have cleaned the dock connections and have done the resets etc. I have noticed if it is below 20% battery it will stay off but any % over 20 it just turns back on, Anyone help me on this please! Also to add if plugged into the charger it will turn off fine.
  • Why does my iPhone shut down? When I touch my screen a little hard and let my finger stay there for some seconds, some white and black lines appear and then the whole iPhone shuts down. After some seconds the apple logo appears and the mobile turns on again. Can someone please tell me why this happens, and what I can do about it?
  • Why does my Iphone shut down at 20%? When I first got my Iphone 5, it would usually keep running until it got to about 8% battery. However, these past couple of weeks I'm starting to notice that it shuts down at around 20%.Is there a way to fix this problem?
  • Why does my iPhone 3gs constantly shut down? After it freezes and shuts down i try to turn it back on but the battery goes out and you can't turn it on unless you charge it, i see the apple logo and it just shuts down after