iPhone Wi-Fi Calling: Update Your Software Before 15 December 2026
By: Yomojo Editorial Team
Posted: 06 Nov 2026
Last Updated: 06 Nov 2026
Staying connected is important, especially when mobile reception is weak or unavailable. If you use an iPhone with Yomojo, there's an important Wi-Fi Calling update you should know about.
Following a network update from Optus, some iPhone models will need to run the latest available software version to continue using Wi-Fi Calling from 15 December 2026.
Yomojo has sent an email to customers about this change, advising those with affected iPhone models to check their device software and install any available updates before the deadline.
Here's what you need to know and how to update your iPhone.
What is changing with Wi-Fi Calling?
Wi-Fi Calling allows you to make and receive phone calls and text messages over a Wi-Fi connection instead of relying entirely on mobile reception.
It's particularly useful when you're indoors, in areas with poor signal or somewhere mobile coverage is limited.
However, Optus has advised that some iPhones running older software versions may no longer be compatible with Wi-Fi Calling on its network from 15 December 2026.
To continue using the feature, customers with affected devices should install the latest available software update before this date.
Want to know more about where the feature works? Read here: Where you can use Wi-Fi Calling.
Which iPhone models are affected?
The following iPhone models are included in Optus's update notice:
iPhone 11, iPhone 11 Pro and iPhone 11 Pro Max
iPhone SE, iPhone SE (2nd Gen) and iPhone SE (3rd Gen)
iPhone 12, iPhone 12 mini, iPhone 12 Pro and iPhone 12 Pro Max
iPhone 13, iPhone 13 mini, iPhone 13 Pro and iPhone 13 Pro Max
iPhone 14, iPhone 14 Plus, iPhone 14 Pro and iPhone 14 Pro Max
iPhone 15, iPhone 15 Plus, iPhone 15 Pro and iPhone 15 Pro Max
iPhone 16, iPhone 16 Plus, iPhone 16 Pro, iPhone 16 Pro Max and iPhone 16e
iPhone X, iPhone XS, iPhone XS Max and iPhone XR
iPhone 8 and iPhone 8 Plus
iPhone 7 and iPhone 7 Plus
iPhone 6s and iPhone 6s Plus
If your device appears on this list, check your software version to see whether an update is available.
How to update your iPhone software
Not sure how to update your iPhone? Don't worry. You can check for available updates directly through your device settings.
Follow these simple steps:
Step 1: Open Settings
Find and open the Settings app on your iPhone.
Step 2: Go to General
Scroll down and tap General to access your device settings.
Step 3: Select Software Update
Tap Software Update. Your iPhone will check whether a newer software version is available.
Step 4: Download and install the update
If an update is available, tap Update Now or Download and Install, depending on the option displayed on your device.
Step 5: Follow the instructions
Follow the on-screen prompts and allow your iPhone to complete the installation. Your device may restart during this process.
A few things to remember before updating:
Connect your iPhone to a stable Wi-Fi network.
Make sure your device has a sufficient battery or is connected to a charger.
Check that you have enough available storage space.
Back up your important data before installing a major software update.
If your iPhone says it is up to date, you can check again closer to the deadline if a newer version becomes available.
If you experience problems with Wi-Fi Calling, our Wi-Fi Calling troubleshooting guide provides additional steps to help resolve common connection issues.
What happens if you don't update?
If your affected iPhone is not updated to the latest available compatible software before 15 December 2026, Wi-Fi Calling may stop working on your device.
This means you may no longer be able to:
Make or receive calls and text messages over Wi-Fi.
Make calls to emergency services over Wi-Fi when mobile coverage is unavailable.
It's important to note that calls and messages over the Optus mobile network will continue to work where mobile coverage is available.
Why is Wi-Fi Calling important?
Wi-Fi Calling provides another way to stay connected when mobile reception isn't reliable. It can be particularly helpful in buildings with weak signals, remote areas with limited coverage, and other places where connecting to the mobile network is difficult.
It can also help customers contact emergency services, including Triple Zero (000) and 112, when connected to Wi-Fi and mobile coverage is unavailable.
That's why keeping your device software up to date is important.
Stay connected with Yomojo
A simple software update can help you avoid interruptions to your Wi-Fi Calling service.
If you use one of the affected iPhone models, take a moment to check your software and install the latest available update before 15 December 2026.
Yomojo has also emailed customers about this change to help them understand what they need to do.
For more information about our mobile services, visit Yomojo Mobile Plans.
About this article
Written by
Yomojo Editorial Team
Reviewed by
James Linton, CEO, Yomojo
Published by
Yomojo
Editorial Standards
This article was created by the Yomojo Editorial Team and reviewed by subject matter experts to help ensure it is accurate, up to date and aligned with current Yomojo products and Australian telecommunications information.