New iPhone 13 is blocking random callers.

Go to Settings/Phone and turn off Silence Unknown Callers. If that isn’t the issue, here are troubleshooting steps:

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 - Crowdsourced outage checker

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.
• iOS 16: Open the Control Center and turn off Focus.
• 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)

There is no solution to this problem! Many people have reported it to Apple but as of yet they have not responded with any kind of fix. My wife's number keeps getting tagged as blocked. I unblock it and at some indeterminate time later it is again blocked. The only way I can detect the error is to look at an iMessage group, select my wife and scroll down the info and see "Unblock Caller". Selecting this temporarily unblocks the number but it will reappear later. None of the suggested solutions I have seen fix the problem. I have contacted Apple and ATT neither of which can find an answer. 

tonyfromsnoho wrote:

There is no solution to this problem! Many people have reported it to Apple but as of yet they have not responded with any kind of fix. My wife's number keeps getting tagged as blocked. I unblock it and at some indeterminate time later it is again blocked. The only way I can detect the error is to look at an iMessage group, select my wife and scroll down the info and see "Unblock Caller". Selecting this temporarily unblocks the number but it will reappear later. None of the suggested solutions I have seen fix the problem. I have contacted Apple and ATT neither of which can find an answer.

Do you share an Apple ID with anyone?

tonyfromsnoho wrote:

do you mean like Family sharing? And why would that cause a block?

No, I mean are you sharing a single Apple ID with another person. If you are, anything they block on their phone will be blocked on yours. And vice versa.

do you mean like Family sharing? And why would that cause a block?