Why are calls failing after iOS 18 update?

FOLLOW UP. For me, it seems to be related to the Wi-Fi Calling feature. I have AT&T. I only recently, as in last month or two, turned it on. Something i read triggered me to consider that it might be related to my problem. So, I turned every (probably overkill) setting having to do with Wi-Fi Calling off, and I haven’t had any more Call Failed! issues. Coincidence?

I am on 18.2.1 and the dropped calls just started. I tried calling someone and it looked like the call went through, but it didn’t. I tried a number of times and the call wouldn’t go through. I rebooted the phone and, so far, all is well.

I have an iPhone 15, WIFI calling is on and I am on TMobile.

Turning WiFi Calling off fix my issues too.

I had this exact problem. I turned off my phone for 10 minutes and then turned it back on. I am now able to place phone calls.

Try turning WiFi calling off.

When making a call I get "Call failed!" message. I shutdown my iPhone XS Max, wait a few min, restart, now I can make the call. This has happened at least 3 times since updating to iOS 18.1 from 18.0.1.

However, once I can make the call, I do not experience any issues with the call such as dropped calls.

Knock wood, I haven’t had any issues since I turned WiFi Calling off.

I’m having the same issue and bouncing between TMobile and Apple. Based upon another post, I’m going to turn WiFi calling off as Apple suggested. T-MOBILE says it should stay on but I’m missing at least one call almost everyday.

IOS version 18.3 on iPhone 16 Pro Max with Verizon carrier. Still experiencing the issue and I don't have the luxury of turning off calls over wi-fi due to poor cell coverage in my basement. When I get a text from someone saying, "Your phone isn't ringing again" or I try to call out and get "call failed", I have to restart the phone to temporarily fix the issue. It seems to reoccur every couple of days. PLEASE push a fix for this!

Yup same thing happened to me. My grandfather called me about a family emergency and he kept cutting in and out when I have all bars. I have iphone se 2022 bought it fall 2023. Its not really good when someone calls you about something serious like a family emergency. He literally called me JUST AS I UPDATED....maybe like 10 seconds after I logged in on the home screen where it says update complete. SO CRAZY. Good news is it did give me back all my storage in the iphone storage section. Now I just need them to fix the icloud backup storage bug.

After the ios 18 update some of my call go to voicemail? My iPhone doesn’t make a ringing sound at all. And i checked all my settings. They are good. And it’s my sister’s and brother’s call that I'm missing. I hope Apple fixes this

Having a similar issue with calls going straight to Voicemail and then not appearing for hours later. TMobile told me to keep WiFi calling on while Apple says to turn it off. I think I’ll turn it off and see if it helps my issue. Thanks.

i have an iPhone 13 mini. Some calls do not ring and are not recorded on the list of recent calls yet a vmail is left. Other calls don’t ring on my phone but will ring through my iPad if it happens to be open. Calls to the outside often fail. I too shut down my phone and restart though often this occurs multiple times per day. Wi-fi calling must be left on as ATT coverage is terrible if it is turned off despite the fact the nearest tower is a mile away. My husband has an iPhone 12 and is also encountering the call failures. We need a secure method of communicating so Apple must immediately elevate this IOS 18 issue. My phone is fully updated to the latest version.

Apple FINALLY admitted it has ongoing problems with all versions of iOS18. In my case, my iPhone’s sound notification for email no longer works. Why did I pay for an Apple product if I’m unable to use it because of a technical problem the company apparently is unable to fix? This is unacceptable.

I have an iphone 12. I updated to 18 and went straight to 18.3.1 and my phone has a ton of issues. I can receive calls and missed calls are logged ONLY if I am solely on cellular and have wireless turned off to my phone. As soon as I turn it on, I don't receive incoming calls at all. They don't appear as missed calls either. There is NO log of them and I have family emergencies happening right now. This is a nightmare. The most basic function of a cell phone and it to make and receive calls and yet apple can't get it sorted.