iPhone 13 voice calls intermittently going to voicemail

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, such as call forwarding.
• 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)

Backup, restore to factory,  and   test, then restore from backup:- 

(If the phone needs attention or replacing you will have to do this anyway)

(1)          How to back up your iPhone, iPad, and iPod touch - Apple Support

(2)          Restore your iPhone, iPad, or iPod to factory settings - Apple Support

Then set up as new (manually) without any restore and test the phone again.

If the problem goes away then it is a setting that you missed, probably another Focus than DND.

If the problem remains then contact Apple Support to report a faulty phone (tell them what you did to test it)

(3)          Restore your iPhone, iPad, or iPod touch from a backup - Apple Support

In that case nobody here can help further. It's between you, Apple Support and your local consumer protection laws

You should first reach out to Apple Support directly. You should be able to reach them here

Contact - Official Apple Support

or phone numbers

Contact Apple for support and service - Apple Support

Voicemail is a specific cellular carrier service.

If your carrier offers that service AND if your traffic plan includes Voicemail, they should be able to solve your problem.

When you contact them, try to speak to a technician, not a salesperson.

Regards

Giulio

I am trying to find more people that this is happening to because it’s obvious they know it’s an issue!

my husband and I both have been having the same issue since we switched to IPhones OVER A YEAR AGO! We have been in our carrier's store repeatedly, on the phone with Apple repeatedly, customer service, technical support, EVERYONE again and again and again. I am so tired of paying over $300 a month for services we are NOT receiving! They have swapped phones, SIM cards, reset, reconfigured… nothing has helped. Now my husband’s job is in jeopardy because he can rarely be reached to respond to emergency service calls. My 4 year old was running a fever of 104 at her daycare and they were unable to reach me because of this issue. This has become a huge problem that is now affecting the safety and livelihood of my family. DO BETTER APPLE!

I had the same problem the last couple of days on my iPhone 13 and on my husband’s iPhone 13. I turned off the wifi and I am now getting my calls. I did the same with my husband’s phone and he now gets his calls. I had tried everything else and nothing had worked.

try turning off your WiFi. Hope it works for you!

ivonnek wrote:

I had the same problem the last couple of days on my iPhone 13 and on my husband’s iPhone 13. I turned off the wifi and I am now getting my calls. I did the same with my husband’s phone and he now gets his calls. I had tried everything else and nothing had worked.

try turning off your WiFi. Hope it works for you!

Go to Settings/Cellular and turn off Wi-Fi Calling.

I need to add that this advice follows your elimination of the SIM as a cause of the problem.