Most of us know how to activate Windows 8, Windows 8.1 or Windows 7 operating system online and even some of us know very well how to activate Windows 8 Enterprise edition using slui.exe. But very few Windows users know how to activate Windows 8 by phone number.Basically, there are two ways available to activate Microsoft Windows. One is through the Internet and second is by phone number. In today’s tutorial, we will show you how to activate Windows 8 by phone.Addition to this, you are also going to get the complete list of Microsoft Volume Licensing Activation Centers Worldwide Telephone Numbers at the end of this article.Before describing the Windows 8 activation by phone, we would like to simply clear that there is a very simple difference between the Windows Activation process and Windows registration process. After entering the Confirmation ID, click on Activate button to activate your copy of Windows.Once Windows is activated successfully, you will be able to view the Licensing Status and Activation ID of your Windows OS with slmgr.vbs.To check your Windows OS activation status, press the Windows + R keys together to open the Run dialog box and enter slui.exe then hit Enter button. You will see the activation status as shown in below screenshot:Keep in mind that you can follow the same procedure for activating any version of Windows. You might also like to see: Microsoft Volume Licensing Activation Centers Worldwide Telephone numbersIf you are a Microsoft Volume Licensing customer and wish to activate your Windows (Windows 7, Windows 8, Windows 8.1, or Windows 10 Operating System) by phone, you can use these Microsoft Product Activation Center phone numbers:Australia (61) (2) 9870 2131 1800 642 008Brazil (11) 3217 3521 (0) (800) 888 4081Canada (716) 871 2781 (888) 352 7140India (91) 80 4010 3000 1800 11 11 00 or 1800 102 1100.