1 Microsoft Lumia 640 - Troubleshooter and repairs Got a problem with your Microsoft Lumia 640? Try our interactive diagnostic tool or book a repair if you can’t fix it
2 Microsoft Lumia 640 - Perform a soft reset Find out how to perform a soft reset on your Microsoft Lumia 640
3 Microsoft Lumia 640 - Show or hide caller ID Find out how to show or hide caller ID on your Microsoft Lumia 640
4 Microsoft Lumia 640 - Setting up WiFi Calling Find out how to set up WiFi Calling on the Microsoft Lumia 640. Just follow three simple steps to get started.
5 Microsoft Lumia 640 - Forget a WiFi network connection How to forget a WiFi network connection on your Microsoft Lumia 640
6 Microsoft Lumia 640 - Pin an app to the start screen How to pin an App to the start screen on your Microsoft Lumia 640
7 Microsoft Lumia 640 - Perform a master reset Find out how to perform a master reset on your Microsoft Lumia 640
8 Microsoft Lumia 640 - Enable or disable flight mode Find out how to enable or disable flight mode on your Microsoft Lumia 640