How to bring a mobile phone for fitness?

When you exercise in the gym, you can take your mobile phone with you, and at the same time you can put some music in your mobile phone that is more suitable for listening to during exercise, so that you can exercise more effectively. But also can effectively protect your property. If there is a temporary call, you won't miss the important call and avoid some unnecessary things. So you can take your mobile phone with you when you exercise in the gym.