To activate Windows 10, 8.1 or 7, via phone system, please open the Windows cmd.exe in administrative mode.

Open cmd.exe with admin

After, change key with cmd type “slmgr.vbs /ipk XXXXX-XXXXX-XXXXX-XXXXX-XXXXX (this xxxxx is key)

and use cmd.exe again type “SLUI 4” and press enter

Note :
1. Is the windows 8, 8.1 and 10 activated, SLUI 4 not bring phone activation in windows 8!
2. Sometime the W-LAN and LAN has to be deactivated!
Choose your country and click next.

Call the Toll free to get confirmation id.

After Insert Confirmation ID, done Activate Windows.