How to Install and Activate Office 2021 Professional Plus with Phone Activation Method

August 12 2025, 2 min reading time

If you've got a Microsoft Office 2021 Professional Plus License with phone activation, this guide will walk you through everything — from downloading the installer to completing activation by phone method.

Let’s get started.

Step 1: Download Office 2021 Pro Plus

You can download the official Office 2021 ISO file directly from the resources section available on our website or from Microsoft's official website.

Step 2: Install Office 2021

No complex steps here — installation is automatic.

Run setup.exe from the mounted ISO.
Office 2021 Pro Plus will install in the background.
Wait a few minutes for the process to complete.

Once installed, open Word or Excel. You’ll now be asked to activate Office with product key. Enter the product key you received with your purchase and after that follow the instruction below.

Step 3: Activate Office by Phone

🔹 1. Start Phone Activation

When prompted to activate, choose: “I want to activate the software by telephone.”

🔹 2. Choose Your Region

Select your country or region from the dropdown.
This will display the correct toll-free phone number for Microsoft activation.

🔹 3. Call Microsoft

Dial the number shown.
An automated voice system will ask for your Installation ID (Your installation ID will be showing in the highlighted area of activation window as shown in the below image).
Enter the numbers showing in installation id into the call prompt using your phone keypad.

🔹 4. Get the Confirmation ID

After validating your Installation ID, Microsoft will give you a Confirmation ID you can note it down wherever you can.
Enter the confirmation ID in the boxes showing in the activation window (Area highlighted in the below image).

Once entered correctly, click Next and activation will be completed.

Installing Office 2021 Professional Plus using the ISO file and activating it by phone is a simple and reliable process — giving you full access to Microsoft’s powerful productivity tools without any hassle.

You can get your genuine Office 2021 Professional Plus product key and much more instantly right here on our store — just add it to your cart, and you’ll be ready to activate in minutes.