Select an option from Settings > Sounds & Haptics > Ringtone to set a new default ringtone. You can use a third-party app to create a custom ringtone. Select it as the default in the Ringtone settings ...

You can mute an iPhone in two ways, and we recommend doing both when you need quiet. Here's how to turn on silent mode and lower volume on an iPhone.

If there's no sound on your iPhone, there are a number of possible causes. Here's how to solve the issue.