Mobile phones are very useful. We use them to do many things. When I was young, they were just for sending SMS and calling people. Now, we use them for everything! I use my phone to call and to send messages of course. But I also use it to read the news, to check email, to take photos, to check the weather, to listen to music and podcasts, to check Japanese words in the dictionary and to watch TV! Mobile phones are so powerful now, people also use them to play video games.