1. Open the application drawer or home screen of the mobile phone and find the application icon whose icon shape needs to be changed.

2. Press and hold the application icon until some operation options or pop-up menus appear.

3. In the pop-up menu, select "Edit" or "Change Icon" option. The specific option names may be different for different mobile phone brands.

4. After entering the icon editing interface, select "Shape" or "Style" option.

5. In the shape options, select a square icon shape. There are generally many shapes to choose from. You can browse and choose a suitable square. Sony mobile phone is a mobile phone product produced by Sony. Sony mobile phones are famous for their high-quality audio and camera functions, and their flagship models usually have excellent sound quality and picture quality.