My iphone does not always wake up when a call comes in. When I wake it up it shows a missed call. Is there a way to fix this?

You can try a hard restart, which is holding down the Home and Sleep/Wake buttons for around 15 seconds until the Apple logo shows up. If that doesn't work you might have to restore your iPhone. If you want to restore your iPhone, you have to connect it to your computer. Hold down the Home and Sleep/Wake buttons at the same time for about 10 seconds. Then after 10 seconds release ONLY the Sleep/Wake button. Your computer should say that your iPhone is now in recovery mode and you can now restore it via iTunes.

Turn the iphone off, hold the menu button, now plug in the usb cord that is connected to the computer. Keep holding the menu button until a dock connector appears on the screen. You're now in recovery mode and should be able to restore your iPhone. If that doesn't work you may have a broken logic board. Here is an iPhone Repair Guide that shows how to open an iPhone. Boards are easily available on Ebay. If you want somebody else to do it for you go to iPad Repair

iPhone may exhibit a problem where it does not respond to any button, switch, or touchscreen input.
To turn it off, 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 on, press and hold the Sleep/Wake button until the Apple logo appears.
If the iPhone 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:

Before following the steps you need to take a backup of your iphone

Press and hold the Sleep/Wake button and the Home button at the same time for at least ten seconds.

When you connect your iPhone to your computer, an iPhone icon should appear in iTunes in the left column under Devices. But if it doesn't, this troubleshooting assistant can help.

1. Make sure your computer has the following:

• USB 2.0 port
• The latest version of iTunes

and one of the following operating systems:

• Mac OS X version 10.4.11 or later
• Windows XP Home or Professional with Service Pack 2 or later
• Windows Vista Home Premium, Business, Enterprise, or Ultimate Edition

If your computer does not meet these requirements, you will need to upgrade your computer before using iPhone.

2. If iPhone is very low on power or if the battery is fully depleted, it can take up to 10 minutes to appear in iTunes.

3. Connect iPhone to a USB port that is built into the computer instead of the keyboard or an external USB hub.
If iPhone still doesn't appear in iTunes, try a different USB port.

4. Restart the iphone:
To restart iPhone, first turn iPhone off by pressing and holding the Sleep/Wake button until a red slider appears. Slide your finger across the slider and iPhone will turn off after a few moments.
Next, turn iPhone on by pressing and holding the Sleep/Wake button until the Apple logo appears.

If iPhone not responding? To reset iPhone, press and hold the Sleep/Wake button and the Home button at the same time for at least 10 seconds, until the Apple logo appears.

5. If you face the same issue reinstall the latest version of itunes

If this does not resolve the issue, try completely uninstalling iTunes and then reinstalling the latest version of iTunes.

Even after following the steps if you face the same issue, then it must be some third-party software (such as security software, anti-virus software, and webcam drivers) may prevent iTunes from recognizing your iPhone. You may have to update your software, adjust software settings, or temporarily disable the software.
In Windows, MSCONFIG is used to troubleshoot conflicting software. For assistance using MSCONFIG, select from the following:
XP | Vista

Try reseting the device

1. Press the home button (the big circle below the screen) and the sleep wake button (the button on top of the iPhone) simultaneously.
2. 2Hold both buttons simultaneously for a few seconds, Ignore the "Slide to power off" and keep holding
3. 3The iPhone should now shutdown automatically - (fade to black)
4. 4Turn the iPhone back on by hitting the sleep/wake button.
5. 5You should now see the Apple logo, your iPhone is restarting and thus booting up.
6. 6You have completed a hard reset successfully.

iPhone may exhibit a problem where it does not respond to any button, switch, or touchscreen input.

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 on, press and hold the Sleep/Wake button until the Apple logo appears.

If the iPhone 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:

Before following the steps you need to take a backup of your iphone

Press and hold the Sleep/Wake button and the Home button at the same time for at least ten seconds.

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...

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 few 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

Download the Insomnia app through CYDIA. Phone must be jailbroken to install this.

Try this,if niether work,you need a new battery

Soft Reset
1. Press and hold the Sleep/Wake button on the top of the unit until a red slider appears
2. Drag the slider on the screen
3. Press and hold the Sleep/Wake button until the apple logo appears.

Hard Reset
Press and hold both the Sleep/Wake button and the Home button for about ten seconds, until the Apple logo appears.

You can always JailBreak it with QuickPwn, get it at www.iKnowApple.com and find an app on Cydia that will let you bypass the need for a lock button.