My phone isn t ringing iPhone

Tap Settings > General > Reset > Reset All Settings

Now restart the iPhone.

Hold the On/Off Sleep/Wake button down until the red slider appears. Slide your finger across the slider to turn off iPhone. To turn iPhone back on, press and hold the On/Off Sleep/Wake button until the Apple logo appears.

Before you do anything that Carolyn suggests, is the Ring/Silent switch on:

Tap Settings > General > Reset > Reset All Settings

Now restart the iPhone.

Hold the On/Off Sleep/Wake button down until the red slider appears. Slide your finger across the slider to turn off iPhone. To turn iPhone back on, press and hold the On/Off Sleep/Wake button until the Apple logo appears.

Same exact problem last night and it absolutely was the ring/silent switch!  Thank you. 

Before you do anything that Carolyn suggests, is the Ring/Silent switch on: