How To activate Windows by phone?
To activate Windows 10 using an internet connection:
As Windows 10 will automatically activate if you are connected to the internet, you can confirm your activation status by selecting Start > Settings > Update & Security > Activation and looking under Windows.
Try the activation troubleshooting in Activate Windows 10 first if online activation doesn't work. Activate Windows 10.
To activate Windows 10 by phone:
1. Select Start > Settings > Update & Security > Activation.
2. Under Activate Windows Now section, select Change product key
3. Choose Next after picking your location (or the location closest to you) from the drop-down list.
4. Copy the Installation Id (IID)
5. Go to: https://getcid.info/ and Enter the Installation Id (IID) to the Clipboard on Installation Id (IID) box. Click GET.
6. Following receiving the Confirmation ID (CID). Select "Enter confirmation ID" from the activation popup.
7. Fill out the Confirmation Id (CID) fields in A, B, and C, then click the "Activate Windows" tab.
8. If your product key is valid and the numbers have been typed in correctly, you should be all set
credit:getcid.info