It may be a contact problem with the headphone jack or mobile phone plug, or an incorrect setting in the mobile phone settings.

The problem can be solved by cleaning the socket and restoring factory settings.

The specific solutions are as follows:

1. Settings-General-Accessibility-Use of incoming calls in physical activities (default).

2. Use the headphone jack of the iPhone, turn on the iPod to listen to music, then press pause, press the home button to return, turn off the iPhone (no need to use other third-party software), unplug the headphones, and then turn on the phone. It can be solved. If it doesn't work, try a few more times and it still doesn't work. Press and hold power home to perform a hard reset, and then pull out the headphones when the white apple appears.

3. We can simulate the action of listening to music, but this time when unplugging the headphones, don’t pull them off too fast, but rotate them gently. Sometimes I unplug it too quickly and the phone's program doesn't respond. So keep it in headphone mode.

4. When the earphones are turned off, we unplug the earphones, find a needle, and gently poke it into the earphone hole twice. It may be that the bounce device inside does not return when the earphones are unplugged. In place, after we poke it, wrap the needle with toilet paper, wipe the inner wall of the headphone hole, and wipe off the dust covering it.