iPhone 15 has no SIM or network after iOS 26.5 update

"iPhone 15 has no SIM or network after iOS 26.5 update: No sim/ no network issue after updating my IPhone 15, 128gb variant with IOS version 26.5."

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Troubleshooting "No SIM" No Network After an Update:

So, what's the network you are referring to that has issues? Cellular? OR WiFi?

A. Overview this Site: If you See 'invalid SIM' or 'no SIM' on your iPhone or iPad - Apple Support

B. Check for Carrier Updates: Manually Update Carrier Settings on your iPhone or iPad - Apple Support

C. Whom to Contact: Contact your Carrier, as they are the one who provide you with the service of configuring your SIM Card.

D. Report this to Apple...

So, 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 you occurrences, 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

Again, as previously posted:

Contact your carrier.

It might appear that your carrier needed to push-out a Carrier Update as a follow-on to the iOS update …

… but failed to do so.

The same answers provided in the comments above still apply. Please contact your carrier’s support team for assistance with SIMs and re-establishing service.

Re: “… I request Apple to reconsider my case for a goodwill repair, subsidized repair, or alternative resolution …”

You’re only addressing fellow users in this community. Apple does not officially participate in these discussions.

You may make your request to Apple via their official mechanism here:

Official Apple Support

Same happened to my iPhone 15 Pro. After update I lost all eSIMs, inserting a physical SIM doesn't help. It's not possible to install a new eSIM too (the option in the menu is gone).

With inserted physical SIM (tested on another device - working):

When I tap the Primary - all blank:

Is happening the same to me in the same iOS version.