If it's a picture of the same picture then it's known as the Droste effect. But a more generic for this is just a recursive picture.
It's on your desktop.
Open the phone's casing with a screwdriver. Then, find a magnet, wipe it over the phones hard drive. Try to open your computer case with a screwdriver as well, and wave the magnet over your hard...
There are a lot of software which can help you. The most famous are Photoshop, Corel Draw and so on.
when there is a picture in a picture, we use the term, "inscribing" This is because, there is a picture, inside another picture.