No data and phone signal after iOS26 update

Go to Settings > General > About to check for a carrier update which may be required.

Then Force Restart your iPhone.

• Press and quickly release the Volume Up Button
• Press and quickly release the Volume Down Button
• Press and hold the Side Button until you see the Apple Logo (Up to 30 seconds, past the Power Off slider)

After go to Settings > General > Transfer or Reset iPhone > Reset > Reset Network Settings.

Lastly, contact your carrier to troubleshoot.

Have you tried a forced restart:

1. Press and quickly release the volume up button.
2. Press and quickly release the volume down button.
3. Press and hold the side button until you see the Apple logo (this might take longer than 10 seconds).

The operative word here is QUICKLY for the first two buttons, then a long hold for the SIDE button; and try it a couple of times, the timing is a little tricky. If done correctly this will always work unless the phone has a hardware problem.

If that doesn’t fix it, Do you have a 3rd party VPN installed, even if you are not using it? If so, delete the VPN profile in Settings/General/VPN & Device Management/VPN, then restart your device. Don't just turn it off; delete the profile. If that fixes it, you can try reinstalling VPN, but probably shouldn't.

And the last step is to contact your carrier.

I forgot about the carrier update: Thanks!