Unable to make calls, send messages, or access internet after iOS 26 update on iPhone 14 Pro Max

Check with your cellular carrier for help in troubleshooting this. It has also been reported in a few threads that iPhone 14 with dual SIM slots have gotten this fixed by switching to the other SIM slot.

"Unable to make calls, send messages, or access internet after iOS 26 update on iPhone 14 Pro Max: please i can’t make calls, send messages and have access to internet after downloading ios 26 on my 14 pro max after updating my phone to IOS 26. please kindly help me out"

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Native-Apps NOT Working After iOS Upgrade:

Being a commonly-reported issue,...

A. Contact your Carrier:

Give your carrier, and see if they’ve had any complaints about this. Report back what they have to say in this. It may come down to getting a new SIM card or eSIM card for your device.

B. Report this to Apple:

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