how do I unmute the ringtone

Hello CathyBW, 

It sounds like your iPhone is not ringing, is that right? We'd like to help.

First, please ensure your iPhone isn't in Silent mode. More about that here: How to put your iPhone on vibrate, ring, or silent mode

If your iPhone isn't in Silent mode, please let us know if Do Not Disturb is enabled. You can find more information about viewing and managing Do Not Disturb settings here: Use Do Not Disturb on your iPhone, iPad, and iPod touch

Thanks!