My iphone wont turn off

Hold down the lock button and at the same time hold down the home button for about 5 seconds and you will force it to restart

you can try the following steps

1. Press and hold the Sleep/Wake button until the red slider appears. When you see the red slider appears, release the Sleep/Wake button.
2. then press and hold the Home button for six seconds

if the screen is still unresponsive try to restart the iphone by following these steps

1. To turn the unit off, press and hold the Sleep/Wake button until the red slider appears.
2. Slide your finger across the slider to turn off iPhone.
3. To turn the iphone on, press and hold the Sleep/Wake button until the Apple logo appears.

if restarting does not work, try resetting the iphone

1. Press and hold the Sleep/Wake button and the Home button at the same time for at least ten seconds or until you see the apple logo appears

if your screen becomes responsive, try to reset the settings by going to the settings of y ur iphone then general then reset and reset all. after this, restore the files on your iphone through itunes

How to turn off: Press and hold the Sleep/Wake button for a few seconds until the red "slide to power off" slider appears, then slide the slider.

But if it doesnt work you may reset the phone by following the step below.

Press and hold the Sleep/Wake button and the Home button together for at least ten seconds, until the Apple logo appears.

Your phone might be having some connection problems restarting it should fix it here are some different ways to restart the phone if it still does not work with one way try the other:(It can also be relate to your network maybe low signal or no reception at all)
Reboot:
1) Turn on iPhone.
2) Hold Sleep/Wake button (top right) until a red slider appears and says Slide to Power Off.
3) Slide the red slider.
4) Once the chasing lines are gone and the screen is black, hold the Sleep/Wake button for about 2 seconds. Your iPhone is now rebooting.

Hard Reset:
1) Power iPhone on.
2) Hold the Home and Sleep/Wake buttons for about 7 seconds, or until the screen turns black.
3) Your iPhone should reboot. If it doesn't don't worry, just hold the Sleep/Wake button for about 2 seconds.

Restore:
1) Connect to iTunes.
2) Allow your iPhone to back up and finish the sync.
3) In the Summary tab, click the Restore button.
4) Click Restore and Update to the confirmation message that appears.
5) Follow on-screen instructions from there on.

Download the latest iTunes to your computer and reset the iPhone. Then re-sync it.

Reset

To reset iPhone, press and hold the Sleep/Wake button and the Home button at the same time for at least 10 seconds. During this time, a red "power off" slider may appear and the screen may go black, but do not release Sleep/Wake and Home buttons until the Apple logo appears.

If iPhone won't turn on, or the display freezes or doesn't respond

1. Press and hold the Home button for at least six seconds, until the application you were using quits.
2. If that doesn't work, turn iPhone off and turn it on again. Press and hold the Sleep/Wake button on top of iPhone for a 10 seconds until a red slider appears, and then slide the slider. Then press and hold the Sleep/Wake button until the Apple logo appears.
3. If that doesn't work, reset iPhone. Press and hold the Sleep/Wake button and the Home button at the same time for at least ten seconds, until the Apple logo appears

More resets:

Try This:
1. Remove Sim Card
2. Hold in 'Home' button and 'On/Off' button together until Apple logo appears
3. Replace Sim Card
4. Hold in 'Home' button and 'On/Off' button together until normal phone screen appears.


Also, Try this:
1.) Shut down the iPhone 3G.
2.) Start up iTunes
3.) Hold down HOME button on the iPhone 3G
4.) While keeping the HOME button depressed, plug in the Sync cable
5.) A message will pop up to ask if you want to reset.
6.) Just click YES and the reset process should start.

I’m happy to assist further over the phone at https://www.6ya.com/expert/joe_8b8c2cd6ce148309

This may not fix it if you "jail broke"it:::

Download the latest iTunes to your computer and reset the iPhone. Then re-sync it.

Reset

To reset iPhone, press and hold the Sleep/Wake button and the Home button at the same time for at least 10 seconds. During this time, a red "power off" slider may appear and the screen may go black, but do not release Sleep/Wake and Home buttons until the Apple logo appears.

If iPhone won't turn on, or the display freezes or doesn't respond

1. Press and hold the Home button for at least six seconds, until the application you were using quits.
2. If that doesn't work, turn iPhone off and turn it on again. Press and hold the Sleep/Wake button on top of iPhone for a 10 seconds until a red slider appears, and then slide the slider. Then press and hold the Sleep/Wake button until the Apple logo appears.
3. If that doesn't work, reset iPhone. Press and hold the Sleep/Wake button and the Home button at the same time for at least ten seconds, until the Apple logo appears

More resets:

Try This:
1. Remove Sim Card
2. Hold in 'Home' button and 'On/Off' button together until Apple logo appears
3. Replace Sim Card
4. Hold in 'Home' button and 'On/Off' button together until normal phone screen appears.


Also, Try this:
1.) Shut down the iPhone 3G.
2.) Start up iTunes
3.) Hold down HOME button on the iPhone 3G
4.) While keeping the HOME button depressed, plug in the Sync cable
5.) A message will pop up to ask if you want to reset.
6.) Just click YES and the reset process should start.

I’m happy to assist further over the phone at https://www.6ya.com/expert/joe_8b8c2cd6ce148309

If something isn't working right, restarting, force quitting an application, or resetting
iPhone will likely solve the problem.
Restart iPhone: Press and hold the Sleep/Wake button until the red slider appears.
Slide your finger across the slider to turn off iPhone. To turn iPhone back on, press and
hold the Sleep/Wake until the Apple logo appears.
If you can't turn off iPhone or if the problem continues, you may need to reset. A reset
should be done only if turning iPhone off and on doesn't resolve the problem.
Force quit an application: Press and hold the Sleep/Wake button on top of iPhone
for a few seconds until a red slider appears, and then press and hold the Home button
until the application quits.
Reset iPhone: Press and hold the Sleep/Wake button and the Home button at the
same time for at least ten seconds, until the Apple logo appears.

If something isn't working right, restarting, force quitting an application, or resetting
iPhone will likely solve the problem.
Restart iPhone: Press and hold the Sleep/Wake button until the red slider appears.
Slide your finger across the slider to turn off iPhone. To turn iPhone back on, press and
hold the Sleep/Wake until the Apple logo appears.
If you can't turn off iPhone or if the problem continues, you may need to reset. A reset
should be done only if turning iPhone off and on doesn't resolve the problem.
Force quit an application: Press and hold the Sleep/Wake button on top of iPhone
for a few seconds until a red slider appears, and then press and hold the Home button
until the application quits.
Reset iPhone: Press and hold the Sleep/Wake button and the Home button at the
same time for at least ten seconds, until the Apple logo appears.

Unlock the screen.
Press the button on the top of the phone and hold it down.
In approximately 5 seconds a "slide to power off" message should appear.
Slide the slider and power off the phone.

If this does not work take it to an Apple or AT&T store.

If this helps please vote for my solution.

Try forcing an application to close
To force an application to close, follow these steps:
iPhone or iPod touch running iPhone OS 3.0 or later

1. Press and hold the Sleep/Wake button until the red slider appears. When the red slider appears, release the Sleep/Wake button.
2. Instead of dragging the red slider, press and hold the Home button for six seconds.
3. If the device does not return to the Home screen, see the steps below to restart.

iPhone or iPod touch running iPhone OS 2.2.1 or earlier

1. Press and hold the Home button for six seconds.
2. If the device does not return to the Home screen, see the steps below to restart.

If the iPhone or iPod touch remains unresponsive, try restarting the device:
Restarting iPhone or iPod touch

1. To turn it off, press and hold the Sleep/Wake button until the red slider appears.
2. Slide your finger across the slider to turn off iPhone.
3. To turn iPhone or iPod touch on, press and hold the Sleep/Wake button until the Apple logo appears.

If the iPhone or iPod touch remains unresponsive after trying the above steps or if it is in a different state, such as showing a persistent Apple logo on the display, try resetting the device:
Resetting the iPhone or iPod touch
Press and hold the Sleep/Wake button and the Home button at the same time for at least ten seconds.

Hope this helps...