Instagram is celebrating its 10th birthday, allowing you to change the app's icon throughout October 2020. There are twelve options to choose from, including the classic Polaroid icon. See below exactly how you can change the Instagram app icon on your iPhone.
First, go to the App Store and check for app updates. Then open the Instagram app on your iPhone and tap the profile icon in the lower right corner.
Here, click on the menu icon in the upper right corner.
From the pop-up window, select "Settings".
Select the application icon you want to go to. You can choose the classic Polaroid camera, the original Instagram logo or any of the other custom icons.
The icon will change and a pop-up will appear message which will confirm the change. Click the "OK" button to ignore this pop-up window.
Now, when you return to your iPhone home screen, you will see the updated app icon.