Why does the phone ring when charging?

The biggest possibility is that the charging cable is in poor contact with the mobile phone, which causes the mobile phone to keep prompting to make a noise.

If the poor contact is caused by the loose interface of the USB card holder, you can first try to stick some transparent glue on one side of the data cable, that is, stick some transparent glue on the side that needs to be pressed down (the USB data cable is hexagonal and relatively small). If you get in touch, it can be solved. You can also pick up the copper piece of the data line interface with a needle. These measures are to ensure good contact as much as possible, so as to solve the problem.