My iPhone 13 Pro doesn’t always ring. Ringer is on with volume and it can be any of my contacts at any time. What could be wrong?

FIRST: Are there missed calls in Phone/Recents on the phone? If they are not the problem is in the network, because the calls aren’t getting to your phone. Contact your carrier: 

• check with your carrier that they don’t have a local outage, and that you didn’t have any settings that would have immediately invoked voicemail
• check up on them at Down Detector - outages

If they are in Recents here’s what to check:

• Check the MUTE switch on the left side of the phone, above the volume buttons. It should be towards the screen
• Check the volume setting. With the Home screen displayed, press the VOLUME UP button on the left side of the phone. It’s above the VOLUME DOWN button.
• Go to Settings/Phone. There’s a switch for Silence Unknown Callers. If it is on any calls from numbers not in your contacts will go directly to voicemail.
• Also in Settings/Phone: Make sure Call Forwarding is off.
• iOS 14 & older: Go to Settings/Do not Disturb. Turn it off if it is on. Also turn off Scheduled. With both off none of the other switches there matter.
• iOS 15: Go to Settings/Focus, and verify that all focus settings are disabled.
• Go to Settings/Sounds & Haptics. Make sure there is a sound assigned to Ringtone.
• Go to Settings/Accessibility/Touch/Call Audio Routing and make sure Auto-Answer Calls is off.
• Go to Settings/Screen Time/Communications Limits. Tap each of the 2 entries and make sure both are “Everyone"
• Restart your phone-->RESTART your iPhone, iPad, or iPod touch - Apple Support
• If all else fails, talk your carrier into replacing your SIM card (thanks to ASC user DShelbyD)

Hello Melody-Man,

Welcome to Apple Support Communities. We suggest first checking that Do Not Disturb was not inadvertently enable on your iPhone. Go to Settings > Focus > Do Not Disturb, and make sure its set to Off. If you are using Do Not Disturb, you can allow notifications from certain contacts or specific apps. This can be added in Do Not Disturb under "Allowed Notifications". Further details can be found here:

Use Do Not Disturb on your iPhone, iPad, and iPod touch

Feel free to reach back out if you have any questions.

Best regards!

Hey Melody-Man!

Even though it is not happening with all calls, check to see if the steps here make a difference: If you can't make or receive calls on your iPhone

Regards.

Hello Melody-Man,

Welcome back to Apple Support Communities!

Lastly, we suggest checking for any pending updates, which can help make sure the software is working as expected. Our Apple Support page has the full steps to help get those updates installed: Update your iPhone, iPad, or iPod touch - Apple Support

If the issue continues, please reach out to an Apple Support advisor for further assistance: Get Support

Cheers!