Short answer
The usual culprits are a Focus mode, Silence Unknown Callers, the Action button set to Silent, or a connected Bluetooth device. Check them in that order.
A phone that doesn't ring is almost always a settings problem.
Check these
- Ring/Silent: press the Action button or open Control Center to check silent mode.
- Focus: swipe down for Control Center and turn off Do Not Disturb or any Focus.
- Settings › Apps › Phone › Silence Unknown Callers — turn it off if you expect new numbers (common with delivery drivers).
- Call Screening and filtering options in the Phone app settings.
- Bluetooth: calls may ring on earbuds or a car you're not using.
- Settings › Sounds & Haptics: confirm a ringtone is set and volume is up.
- Check you haven't blocked the caller (Phone › Blocked Contacts).
- Call forwarding: dial your operator's code or check with e&, du or virgin mobile.
Sources
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