Why does Apple's mobile phone only vibrate without ringing?

That's because the phone is set to mute mode or the sound is turned off. Take the Apple 7 mobile phone as an example.

1. First check whether the mute button on the left side of the Apple 7 phone is turned on. If you see red in the gap of the mute button, the mute button is turned on and off, as shown in the figure below.

2. Open the Apple 7 mobile phone interface, find the settings icon on the Apple 7 mobile phone desktop, and click to enter, as shown in the figure below.

3. After entering the Apple 7 mobile phone setting interface, click Enter Sound, as shown in the figure below.

4. After entering the sound interface of Apple 7 mobile phone, turn on the ringtone mode and turn the ringtone and reminder to the maximum, so that there will be sound when the mobile phone calls, as shown in the figure below.