iPhone 15 Pro some incoming calls don't ring.

Technology can be extremely frustrating, can't it?

To put things in a bit of perspective, there are estimated to be about 1.5 billion active iPhones. So, until we start seeing complaints in the hundreds of thousands, it's probably not a pervasive issue. But that's cold comfort if you're one of the people who's having the problem.

If you haven't already done it, I would suggest that you back up your phone. Then, restore it to factory state using a computer. This will load a fresh copy of iOS. Log back into your Apple Account but don't restore your back up and don't download any third-party apps. Avoid making any changes in Settings, especially Focus. Test it for a couple of days. If it works consistently, it may be that there was something you installed previously that was causing the issue. At that point, you need to decide what to do next. Do you restore the backup and try to figure out what that thing is? Or do you not use the backup and rebuild everything?

Also, have you talked to your carrier?

One possible culprit could be something in your notification settings or Focus modes, which can sometimes filter out incoming calls without making it obvious.

Even if you think Focus is turned off, it might be set to allow only certain people or apps to get through, which could explain why some calls don’t ring. It’s possible that a setting somewhere is muting calls from contacts or numbers that aren’t specifically marked as “allowed,” and you might not even realize it’s happening.

Double-check your Focus modes, including making sure Do Not Disturb isn’t unintentionally enabled, and also to review how notifications are grouped or summarized in the settings. It’s worth ensuring that calls from contacts or important numbers are marked as "Always Allowed" in Focus, and that you're not unintentionally silencing calls with certain filters.

Here’s another possible fix, if it’s not a Focus filter.

Go to Settings > Sounds & Haptics

• Adjust “Ringtone and Alert Volume”
• Toggle “Change with Buttons” to let volume buttons control ringer volume when not on a call

psmadden wrote:

Did you read the part of my post that said, "Please, don't post another useless list of all the common causes. I know what they are, and I've tried them all, numerous times"?

Until you tell us, specifically, what things you've tried, we don't know what you've tried. Your idea of "all" may, in fact, not be everything.

Additionally, troubleshooting is very tedious process. You start with the simple things and test them and then move down the list.

If yo don't feel you're getting the sort of help you need here in this volunteer forum, rather than criticize the people who are being generous with their time, I suggest you contact Apple directly:

Genius Bar Reservation and Apple Support Options - Apple

psmadden wrote:

I just called Verizon. After 1.5 hours on hold, I spoke with tech support. The end result is that he's sending me a network extender. Free. (They're $250.) We'll see if this solves the issue. Thank you for suggesting that I call them.

I hope that resolves your issue!

Try this User Tip. Why doesn’t my phone ring? - Apple Community

Yes, I read your question completely. I also read that you stated to another poster than none of the tips worked. The list I provided has other tips that are not normally listed, and if someone has not read all of Apple's support document, they wouldn't necessarily be aware of.

Thank you for your kindness of volunteers around the world that provide help here on a user to user forum that Apple does not participate in. Don't expect more assistance.