Wi-Fi calling not working ios 26.2

"Wi-Fi calling not working ios 26.2: I use iPhone 16 pro iOS 26.2. Cannot use WiFi-Calling when connect the WiFi. I tried turn on airplane mode waiting 15-30 sec sometime can use WiFi Call. Is this version ios bug or other problem."

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Wi-Fi Calling Not Working:

A. Recent Cellular Outage:

Does Cellular work? Note that there is/was a major Cellular service outage (Verizon, and some reports of AT&T). So, if Cellular is having issues, then that is the potential culprit.

B. Carrier Restrictions:

Be certain it is an option that your Carrier provides. Start Here: Wireless Carrier Support and Features for iPhone - Apple Support

C. Turn Off VPNs:

Do you have an VPNs turned on? Of so, turn them off.

“My Carrier is support this service and used WiFi call before, I am not use VPN”

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Try a Restart:

Verizon (and reportedly AT&T) has/had a Nation-Wide Outage:

Why the issue? Well, it's probably no mere coincidence that there is/was a nation-wide Verizon outage. Wi-Fi is not Cellular, but it might a service provided by the same company. So restart your iPhone (along with all of your other device that may have been affected by this): Restart your iPhone - Apple Support

Source: Check Network Status - Verizon

As it Reads: "The outage has been resolved. If customers are still having an issue, we encourage them to restart their devices to reconnect to the network. We sincerely apologize for the disruption."

WiFi Call is a carrier-specific feature. Contact your Carrier (Cellular Service Provider), the agency that issued the SIM / eSIM to you. --> Make a call with Wi-Fi Calling - Apple Support (IN)

"My Carrier is support this service and used WiFi call before, I am not use VPN."

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Calling Being an Issue:

So, can you make and receive calls? If not, then you still need to wait for services to be up.

In addition to my previous reply...

Troubleshooting Calling:

A. Start Here: If you can't Make or Receive Calls on your iPhone - Apple Support

B. "No Service":

Is "No Service" shown on the top-left corner of your screen? If so, go here to fix that: If you See No Service or Searching on your iPhone or iPad - Apple Support

C. "No SIM":

"No SIM"*** is shown on the top-left corner of your screen. So, go here to fix that: If you See 'invalid SIM' or 'no SIM' on your iPhone or iPad - Apple Support

D. Install a Cellular Update:

It might be prompting you for a cellular update to install. So, go here for that. Update your carrier settings manually on your iPhone or iPad - Apple Support

E. Whom to Contact:

Contact your Carrier, as they are the one who provide you with the service of Calling.