This song is: "Ringtone" (MetroGnomeRemix).

"Ringtone" is a piece of pure music. The listening address is here Ringtone-Single-NetEase Cloud Music.

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The iPhone's user interface has a small piece of hardware, a circular button located under the screen, called the "Home button", and there are five more. The Home button is mainly used to close the application in use, navigate to the home screen interface, or wake up the phone.

The iPhone also has 5 additional buttons: On/Off button - Located on the top of the phone, it serves as the power button. It can also be used as a control to control incoming calls. When receiving an incoming call, press the on/off button once to make the incoming call ring. Disappear, press twice to forward the call to the language mailbox, press and hold to display the shutdown option, and press and hold to turn on the phone after shutting down.

Located on the left side of the fuselage are the mute and volume control keys. iPhone 4 has two round buttons to increase or decrease the volume. The mute key can quickly switch between ringtones, prompts, push notifications, camera shutter, etc. To mute the sound, this key will not stop the alarm application. In some countries or regions, it will not turn off the camera shutter sound, voice memo sound and other sound effects.