How to create an iPhone Apps icon using illustrator cc

Step-1, take a new document with the dimension of 5 inches by 5 inches and click ok.

Step-1, select he rectangle tool and create a new square box.

Step-3, select and Keep the fill color black then go to effect menu-Stylize-Round Corner and keep the Radius to 0.5 inch with the preview checkbox then click ok.

Step-4, select and make two copies of the shape and set them aside.

Step-5, now start working with the first shape with select and go to gradient palate and keep the gradient palate type radial.