Merge calls in IOS26 not working

As this article states:

Make a conference call from your iPhone - Apple Support

”…the ability to add, merge, or disconnect callers — depends on your carrier. Contact your carrier for more information.”

Sameasmyidugh wrote:

It wasn’t until this update that I haven’t been able to complete merge calls. So, it is the update and not my carrier.

Often after an update, the carrier needs to roll out their own update. To come to the conclusion it is not a carrier issue is the wrong conclusion. Contact your carrier who likely needs to re-provision your account. Apple doesn't have anything to do with carrier provided call features. And I'm on iOS 26.2 (the most current version) and have absolutely no issues merging calls.

It's not always the iOS update's fault!  Many things can cause phone problems.  If you tell people you think it's an iOS update, it might make it harder to fix or find a solution for the real issue.

Remember, the right question often leads to the solution!

Was/Is your device Jailbroken? If that's the situation, please be informed that attributing the issues to iOS updates may not be accurate.

iOS updates aim to enhance user experience, boost security, and fix bugs rather than disrupt core features. The majority of the issues after updates might stem from underlying, unmentioned factors. Updates won't typically alter personal data but may refine settings or features. Backup before major updates for safety. Review Apple's update details and backup advice for a smooth process.

Kindly consider checking your settings and addressing any device issues before attributing the issue to external factors. This could be a pure coincidence that the iOS update affected the iPhone functions.

Before initiating a standard iOS update, it's advisable to create a backup. Have you completed this step? If yes, proceed with the restoration from the backup.

See what each update does: OS — iOS 26, About iOS 18 Updates, About iOS 17 Updates, About iOS 16 Updates, About iOS 15 Updates, About iOS 14 Updates, About iOS 13 Updates, About iOS 12 Updates, and so on...

SMS, MMS, WiFi calls, Call Forwarding, Call Waiting, Call Merge, Conference Calls, hotspots, and Voice Mail (Visual or Normal) are all carrier-specific features. Contact your Carrier (Cellular Service Provider), the agency that issued the SIM / eSIM to you.

If your carrier supports it, you can set up a conference call on your iPhone with up to five people.

The number of participants on a conference call — as well as the ability to add, merge, or disconnect individual callers — depends on your carrier. Contact your carrier for more information about your conference call options.

What Call? On an iPhone, you can make and receive various types of calls. Here are the different types:

1. These are standard voice calls made over the cellular network. They utilize your carrier's voice network to connect you with other phone numbers. Allow phone calls on your iPad, iPod touch, and Mac
2. FaceTime Audio allows you to make voice calls over Wi-Fi or cellular data using your internet connection. It provides higher audio quality compared to traditional cellular calls.
3. FaceTime Video enables you to have video calls with other FaceTime users. It uses the front or rear camera on your iPhone to transmit live video during the call. Use FaceTime with your iPhone or iPad - Apple Support (IN)
4. VoIP (Voice over Internet Protocol) calls use internet connectivity to make phone calls. Apps like Skype, WhatsApp, Viber, and Google Hangouts utilize this technology, allowing you to make voice and video calls over the Internet.
5. Some carriers support Wi-Fi calling, which allows you to make and receive calls over a Wi-Fi network instead of relying solely on cellular coverage. This can be useful in areas with weak cellular reception. Make a call with Wi-Fi Calling - Apple Support (IN)
6. The App Store offers numerous calling apps that utilize different technologies. These apps can provide additional features and options for making calls, such as international calling, call recording, and more.

It's important to note that the availability of certain call types may depend on your iPhone model, iOS version, and carrier.