How to set the signal display of Apple mobile phone?

Methods and steps of signal display setting for Apple mobile phone;

Tools/materials: one iPhone (here, take iPhone7 as an example to demonstrate, other models are similar).

1. First open the phone's home screen, then find the "Dial" icon and click Enter.

2. Then click to open the dialing interface.

3. Next, you need to enter the number string "*300 1# 12345#*" in the dialing interface.

4. Then, click the dial button. Wait for a while to enter the "field test" interface. Then press the "Home" button to return to the desktop, and the signal strength will disappear.

5. Then, after the "Field Test" interface, press and hold the power off button until the power off interface appears. Do not click Close and Cancel.

6. Finally, in the shutdown interface, press and hold the "Home" button of the mobile phone. Then return to the desktop, and the signal strength remains unchanged. Here, the display of digital signal intensity is realized.