How to activate Windows 10 or 8.1 via phone system?

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

Open cmd.exe and Run as administrator (Important)

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