AP English Language

Study the sample paragraph below and answer the questions.

Today, phones can do a lot more than just make and receive calls. Most phones come with cameras that take color pictures. Many also have video cameras to record live-action events. You can also use a phone to check your email, surf the Internet, or set reminders for important events with a special alarm clock. Many mobile phones have calculators for solving math problems and fun games to play if you are bored. With all of these new features, it is hard to imagine a world without mobile phones.

What is the concluding sentence?