How to hard reset your Windows Phone 7 using phone buttons
In case you are having trouble with your Windows Phone 7 handset a hard reset may be the last resort. The simplest way would be using the software method that will remove all the data and bring the phone back to the factory default state, as it was when you first opened it from the box pack.
Hard reset your Windows Phone 7 using software method
This method will only work if you are able to boot your Windows Phone 7 and get to the home screen.
Tap start screen > about phone > reset your phone
Just in case you are not able to boot your WP7 handset you can try hard reset using the phone buttons.

How to hard reset HTC Windows Phone 7 handset using phone buttons
This method applies to all the HTC phones (HTC HD7, HTC 7 Trophy, HTC 7 Mozart) running the Windows Phone 7 OS.
If you can turn off the phone do it. For unresponsive or frozen phone, remove the battery and put it back again after few seconds.
1. Press Volume up button and hold then press Volume Down button and hold and then press the power button (briefly) to switch the phone on.
2. Keep holding the volume up and volume down buttons until you see a reset screen option.
3. Now follow the instructions that will show up on your mobile screen to factory reset your phone.
How to hard reset Samsung Focus using phone buttons
1. You need to press all these 3 buttons simultaneously (Volume Down, Power and Camera).
2. When the phone vibrates let go of the power button but continue pressing the volume down and camera buttons.
3. When you see the format prompt on the screen, let go of the volume down and camera button.
Follow the instructions for hard reset.
How to hard reset Samsung Omnia 7 using phone buttons
1. There is a soft reset hole near the power button, press it.
2. Now press the cancel and call button simultaneously and hold it until you see Samsung Omnia on screen.
3. You will then see the reset screen with message format or cancel.
Follow instructions to reset the phone.
How to hard reset LG Optimus S using phone buttons
1. Turn off Optimus S and take out the battery and then reinsert it again after few seconds.
2. Press and hold home and volume down button until the device turns on.
3. You will then see the reset option on the screen, simply follow the instructions.
How to hard reset LG Quantum using phone buttons
1. Switch off the phone, pull battery out and reinsert it again after few seconds.
2. Hold home and volume down button and press power and hold until the device turns on.
3. Follow instructions on screen to reset the device.
How to hard reset Dell Venue Pro using phone buttons
1. Switch the phone off, if it is unresponsive, remove the battery and reinsert after few seconds.
2. Press volume down and camera buttons simultaneously and keep holding it.
3. Press Power button and then release it but continue holding the volume down and camera buttons.
4. Once you see the format screen release the pressed buttons.
5. Follow the instructions to reset your phone to its factory default settings.
More Windows Phone 7 tips and tricks.
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