Human: How to turn on ringer on iphone? Assistant: 
Turn on Ringer on iPhone
1. Check the Silent Mode switch.
2. Increase the volume and/or try another ringtone.
3. Disable focus modes like Do Not Disturb or Sleep.
4. Turn off airplane mode.
5. Disconnect from Bluetooth or AirPlay devices.
6. Turn off the feature that silences unknown callers.
7. Disable call audio routing and call forwarding.
8. Check your block list.
9. Remove spam blocking apps.
10. Turn off Calls on Other Devices.