Have you noticed your iPhone not making any sound when you receive a call? Here are some possible reasons why it may stay silent:

1. Airplane mode turned on by mistake
2. Ringer volume was switched to silent
3. Do Not Disturb mode enabled accidentally
4. Problem with ringtones or notification sounds

We hope this information helps you a lot, also you can check the true Tone feature. This feature is also responsible for it. Check the complete article here.