If your phone is unresponsive, or it gets stuck showing Nokia logo, then try this: Press and hold both the Volume down and the Power keys for 15 seconds. This should get your phone to restart properly again. If this does not help, then follow next steps to perform OS reset.
Warning: Resetting your phone will return it to the same state it was in the first time you turned it on. All your personal content in the phone, including text messages and apps that you been purchased and downloaded (may be re-downloaded again) will be erased, and the phone will be restore to the factory settings.
Here are two options to follow, depending on whether you can access your phone's Settings screen or not.
Option 1: About menu
On the Start screen, swipe left, select Settings > About > Reset your phone.
Option 2: Hardware key combination
Nokia Lumia with Windows Phone 8
Make sure the charger is disconnected.
1. Switch the power Off.
2. Press and hold the Volume down and connect the charger, if succeed an exclamation mark (!) is shown on the screen.
Then input Keys in the following order:
1. Volume up
2. Volume down
4. Volume down
The phone will reset and boot up automatically. Please note that this may take several minutes.
Nokia Lumia with Windows Phone 7
Make sure the charger is disconnected.
1. Switch the power Off.
2. Press and hold the Volume down and Camera keys.
3. Press and hold the Power key.
4. When the phone vibrates, release the power key, but continue holding the volume down and camera keys, until the phone reboots.
It is possible to fix many phone problems yourself in a few minutes – including phone freezes or does not switch on, application crashes, sound problems and a blank display. To save yourself time, try these three fixes.
1. Restart your phone
If the phone hardware is jammed, you should first try restart your phone. This does not reset the Microsoft Account (Windows Live ID) or remove any consumer data.
Option 1: To perform the power reset for phones with integrated battery (phone has a special electronic circuit which switches off the power when the key combination is pressed):
Option 2: To perform power reset for phones with removable battery:
2. Update the software
You might not be using the most recent software for your phone. Updating to the latest version of your phone may resolve your issue.
You can check for the availability of Lumia software updates in your region here.
3. Reset your phone
Warning: This erases all the personal content in the phone, including apps that have been purchased and downloaded (may be re-downloaded again), and restores the factory settings.
To reset your phone to the state in which the phone was in the first time you turned it on, go to Settings > About and then Reset your phone.
If you lose your phone, you can reset your phone remotely. In this option you need have the Find My Phone feature enabled and your phone must be connected to mobile network.
1. Login to http://www.windowsphone.com.
2. Click on the drop down menu right next to your name, and select the device that you would like to erase.
3. At the top left corner, you will see the name and model of the Windows Phone.
4. Click on Erase your phone.
Your Nokia device requests PIN (Personal Identification Number) and PUK (Personal Unblocking Key) codes to protect your SIM card and device against unauthorized use. Note that all PIN and PUK codes are provided by your network operator. Nokia is not able to provide you PIN or PUK codes.
Please note the following:
If you have forgotten or simply do not know the codes, you must contact your Network Operator for assistance. However, if you have already contacted but the code does not work, you should consider getting a new SIM card from your Network Operator.
These kind of messages are displayed in the following situations:
If none of the situations above apply and you continue to receive this error message, your SIM card may be damaged. Please contact your mobile operator or service provider. Or alternately, contact your local Nokia Care Point for inspection.
If there is no response when tapping the touch screen, check the following:
If the touch screen doesn't yet respond, try restoring the factory settings. If you cannot access the factory settings menu via the touch screen (Settings > Phone > Phone mgmt. > Factory settings), try entering the following reset commands via the keyboard. Before resetting the device, take a backup of your phone via Nokia Suite.
If the touch screen is not yet working properly, take the phone to Nokia care point for inspection.
The screen gets turned off during a phone call when the proximity sensor is covered. This is done to avoid accidental touch screen actions when you are in a call.
If the screen gets turned off immediately when dialing a number or receiving a call, check that the proximity sensor area at the upper front of the screen is not covered by any kind of protective film or tape.
You can take the following steps to check the issue. If the screen keeps turned off, the protector may not be of the right size and will block the sensor on the upper part of the front side. Then either remove the protector or cut off the plastic from the blocking area.
Many features in your Nokia Lumia phone increase the demand on battery power and reduce the battery life time. For example if the signal strength of the mobile network varies much in your area, your phone must scan for the available network repeatedly. This increases the demand on battery power.
You can set your phone to automatically save power when the battery charge level is low. To check the battery status, and switch battery saver mode on, go to Settings > battery saver. Windows Phone 8: To choose when you want battery saver mode to be activated, switch Battery saver toggle to On and tap advanced.
Note: When Battery Saver is on, your phone will no longer: automatically receive email and calendar updates, update some Live Tiles and allow apps to run in the background.
If you are listening to music or otherwise using your phone, but do not want to make or receive calls, switch airplane (flight) mode on under the Settings menu.
To save battery power, note the following:
Use network connections selectively
Anything else I need to know?
The instructions to save power on your Lumia phone presented on this video (English) from Nokia Care.
If the battery drains faster even there is no active feature or applications, try to switch off the power and then switch back on. The battery may also be worn out and needs to be replacing with a new one.
Press and hold the Volume Down key and Power key simultaneously until you will feel vibration. The phone will reset and boot up automatically. Note that this does not reset your Microsoft (Windows Live) Account or remove any of your data.
If your phone still does not respond, remove the SIM card and try again.
When the phone switches on, confirm that it has the latest software version by going to Settings > Phone update, and then tap Check for updates.
To restart a device having integrated battery (e.g. Nokia N8-00, E7-00, N9, Lumia 800), press and hold the power key for about 8-10 seconds until the device switches off. Then you can switch your device on again normally.
If you cannot connect the headset to the compatible phone, proceed as follows: