How to adjust the ringtone of an ordinary phone, not a mobile phone, but a fixed phone?

There are many kinds of fixed telephones. Most of the early fixed telephone ringtones can't be modified, and only the default ringtones can be used.

Fixed telephones introduced in recent years support ringtone replacement, which can be selected and used in the built-in ringtone library.

This kind of mobile phone generally supports menu operation. You can enter the settings page through the menu, find the ringtone settings, and then choose your favorite ringtone.