First of all, we can hold the mobile phone as high as possible. Because it takes a long time to bow your head, as the title says, it seems to be something weighing 50 pounds. It may be scary to say it, but it is. Therefore, we can try to hold the mobile phone as high as possible, which can effectively reduce the damage to the cervical spine caused by bowing, and don't bow your head for too long when using the mobile phone.
Secondly, pay attention to the brightness of the mobile phone. Many people like to turn the brightness of their mobile phones very dark or very bright, but in fact, these two methods are very unreasonable. This practice is really harmful to your eyes, so I suggest you adjust the brightness of your mobile phone to automatic, so that your mobile phone will change with the change of external light, so you don't have to worry about adjusting the brightness.
Finally, you must stop and have a rest after watching your mobile phone for a while. You can twist your neck or look at the scenery outside the window. These are very good choices. If you stare at the screen for a long time, you are likely to feel dizzy or have a headache. Therefore, the harm of watching mobile phones is inevitable, and we can only reduce its harm to us as much as possible.