Apple's mobile phone jingles for no reason.

Apple's mobile phone jingles inexplicably for the following reasons:

1. Receiving new messages: Apple phones will send out prompts when receiving new messages such as SMS, email and social media.

2. Low battery: When the battery of Apple's mobile phone is lower than 20%, a prompt will be issued to remind users to charge.

3. Notification Center: If you open the notification center and set the reminder function of related applications, these applications will also give a prompt when there are new news or activities.