Unable to make calls from my iPhone 13 post iOS update, Calls getting Failed

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

“Unable to make calls from my iPhone 13 post iOS update, Calls getting Failed: Two network operators changed and 4 sim replacements done: was working fine in ios 17 issue started after updating ios 18 within one hour”

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Thank you for the followup reply.

Report this to Apple:

It may be no more than an issue with the update. So, report it, awaiting the next install. Do your Part: Provide Apple with feedback on this, letting them know about this issue.  Apple may not get back to you directly, but the more feedback they receive on this, the more they will know what is occurring, and what bug fixes to include in updates to come. Apple will know nothing of this, if you don't report it to them.

1. Go Here: Feedback - iPhone - Apple
2. Select: "Bug Report" for the "Feedback Type"
3. Comment: that this all began after installing an update. Include the URL of this thread.
4. Proceed from there as necessary

Hello~ Click on below and review…

Force restart iPhone - Apple Support

If your call fails or you can’t receive calls on your iPhone - Apple Support

~Katana-San~

“Unable to make calls from my iPhone 13 post iOS update, Calls getting Failed: […]apple customer care saying this is network issue, but on my another android Airtel working fine can any one given resolution”

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Thank you for the screenshot.

Troubleshooting Calling:

Indeed, this seems to be a network error. Contact your Carrier, as they are the one who provide you with the service of Calling. The SIM or eSIM card may need to be reconfigured correctly.

My iPhone 13 no longer fails to make or receive telephone calls after new apple update installed. Phone worked fine prior to update. Diagnostic failed to correct problem. Verizon network is running fine. Internet is working. Phone, not! Anyone find a fix?

I have so many issues after I0S 18 update!!!

[Edited by Moderator]