How to protect teenagers' mobile phones from surfing the Internet healthily?

You can achieve this goal by setting the health mode, as follows:

Step 1: First, select the setting icon of the mobile phone to enter, as shown below:

Step 2: Enter the setting interface and click the option of healthy use of mobile phone, as shown below:

Step 3: After entering, select the following options to turn on the healthy use of the mobile phone, as shown below: