What if the alarm clock of Apple's mobile phone doesn't go off?

If the alarm clock of Apple's mobile phone doesn't ring, you can try the following methods:

1. Check whether the alarm clock time and date are set correctly.

2. Check whether the phone is muted or set to Do Not Disturb mode. If so, you can set the phone to normal mode.

3. Check whether the alarm clock volume is adjusted to the minimum, and you can turn it up.

4. Try to restart the phone, sometimes restarting can solve the problem.

5. If all the above methods fail, you can try to uninstall the alarm clock application and reinstall it.

If the above methods are ineffective, it may be that there is something wrong with the hardware of the mobile phone, and you need to contact Apple customer service or go to Apple's authorized repair point for repair.