Why does the iPhone 16 Pro keep saying "Call failed"?

I am happy to report that when I reset network settings all my problems went away. It fixed my Wi-Fi calling and it’s fixed my Cellular calling. For the record, I spent an hour on the phone with AT&T and they did not give me that suggestion. So thank you guys for helping me.

I’m having the exact same issue. It started about 4 days ago. Called Verizon multiple times and they have tried everything including a full reset. I may get a temporary fix for a few minutes but then it goes back to call failure. Apple is unable to find anything wrong with diagnostic tests. The only solution I have been given from Verizon is to send me a refurbished replacement phone which I am not happy about. I have 3 other of the same phone, iPhone 16 pro, with no issues. Hopefully someone has some answers. Thank you.

The "Call Failed" issue typically applies to outgoing calls because it occurs when your phone attempts to establish a connection to the network and initiate a call. Incoming calls, on the other hand, are reliant on the network's ability to route the call to your phone, which is a different process.

It seems your iPhone is experiencing call connectivity problems, causing calls to abruptly end with "Call Back" or "Cancel" options on the screen, refer to the pics below. This happens when a call is failed which you forgot to mention in your post.

If you are experiencing intermittent silence or drop or the call itself is disconnected during voice calls on your iPhone, there are a few things you can try to fix the issue:

1. Poor signal strength can cause dropouts or silence during a call. Try moving to an area with better reception or switching to a different network if possible.
2. Restart your iPhone --> Restart your iPhone, iPad, or iPod touch - Apple Support
3. Force Restart your iPhone --> Force restart iPhone - Apple Support)
4. This may help too. General Troubleshooting iPhone Issues: St… - Apple Community
5. Check if your audio is not connected to external Bluetooth speakers.
6. Few other reasons why your device keeps Muting / Dropping / Disconnecting Calls or encountering Call Failed.
   1. Your device's cellular signal Is weak.
   2. It's Raining (Cats & Dogs) in your area or in the area where your device is hooked.
   3. The Cell Tower is Overloaded / Heavy Traffic (Telecommunication)
   4. You've misunderstood your signal strength
   5. You are moving and the signal weakens while changing from one tower to another
7. Other culprits may include the following:
   1. Bad Weather: Precipitation can leak into phone cable lines and cause disruptions. Lightening, even at a distance, can disrupt the connection.
   2. Wireless interference: Power lines, radio, or television. transmitters, transformers, and other electronic devices may cause noise on the phone line. --> Resolve Wi-Fi and Bluetooth issues caused by wireless ...
   3. DSL services: The high-frequency signals coming from DSL (digital subscriber line) devices sharing the phone line can create problems for other technology connected to the line.
8. Try to turn on Airplane mode, wait for 10-15 secs, and turn off aeroplane mode.
9. Check the health of your device's Battery. Change if below 80%
10. Take the SIM out and Put it back again, Change your SIM, if it is damaged
11. Time to contact your Carrier / Change if required

I also have the same issue recently. Can’t make or receive any calls. SMS seems to work though. I always got a message that I have a missed call from my voicemail message but no missed call shown on the phone app. Every time I tried to make a call it’s stuck at the Calling screen and after a whole call failed.

I tried everything from restarting my phone, toggling airplane mode, resetting mobile network. It only works temporarily and a few hours later it’s unable to make/receive any calls.

I contacted Apple and they ran some diagnosis and found nothing. Contacted my mobile network provider, they reset the network and it only worked temporarily and the problem came back.

Has your issue been fixed?

I'm having the same problem. I can't make calls and when I reset my phone it works for a little bit and then fails again. I got a refurbished phone and it does the same thing. I had an Iphone 5 that this Iphone 16 replaced and it never had this problem. What's the fix?

Same problem here. Have been back to the Verizon store twice and three times on the phone with Apple, still no permanent solution. Phone drops calls continuously, tonight I can't even make a call without my phone saying "call failed." Ugh. I was told I could do a Warranty exchange for up to a year after my purchase. But I'm afraid I'll get another lousy iPhone that won't work.

Has this been resolved? I’m having the same issue

I’m having the same problem. The only solution Verizon gave me is a replacement refurbished phone. Not happy at all about this solution.