My phone stays on all the , It woun't go to sleep. I have a iPhone 4
Go to settings>General>Acesiblitity>accesive touch
Go to settings, then general, then look around until you find something about sleep timer.
Did you read it a bed time story???
Do you press the lock button on the top o the phone? Thats how i make mine go to sleep
After trying what everyone else has mentioned ....can you take your battery out on that kind of phone? if you can take it out for a couple of minutes and then put it back in and see if that works!
Then turn it off. Hold the power button and the home button at the same time until it tells you to swipe to power-off.