Why does my phone not ring when locked?

Hello mjhfromindiana,

We appreciate you reaching out to us about this matter and are here to help. We would like to ask you a couple of questions in order to get a better understanding. First, what exact version of iOS are you currently using? We ask as the menus and options can change slightly between versions of iOS, and we want to make sure we provide the most accurate steps. You can locate this by going to Settings > General > About. Also, does this system vibrate in the lock screen when receiving notifications or calls? Do you have the device is silent mode when this happens? Finally while you gather that information, check out this link on how to use tones and ringtones on your device and see if everything matches up: Use tones and ringtones with your iPhone, iPad, or iPod touch - Apple Support

We thank you for your answers, they will help guide us to the next troubleshooting step.

Kindest regards!