Summary:
• **Apple is Working on a Foldable iPhone**: Apple is testing a new type of iPhone that can fold in half like a book, similar to Samsung's Galaxy Z Flip phone. This foldable design would let the phone be smaller when closed and bigger when opened, making it easier to carry in your pocket.

• **New Technology Takes Time to Perfect**: Before Apple releases a foldable iPhone to customers, engineers need to test it many times to make sure it works well and doesn't break easily. Apple wants to make sure the folding screen is strong and reliable before people can buy one.