.ooops not anymore for hackers can't use phone activation anymore
UPDATE MAY, 2020. PLEASE NOTE: The instructions below are out of date and no longer appear to be working. See Microsoft’s Windows 10 Activation page. Telephone activation should not be needed for Windows 10 anymore. If you purchased a product key and it’s not activating via the normal methods, there is a real possibility you were sold an invalid license. Return the license to the vendor for a refund if it will not activate, and always purchase Windows 10 either from Microsoft directly, or from a known and reputable vendor.
To activate Windows 10, you need a digital license or a product key. If you're ready to activate, select Open Activation in Settings. Click Change product key to enter a Windows 10 product key. If Windows 10 was previously activated on your device, your copy of Windows 10 should be activated automatically.