Сотовая сеть iPhone 13 не работает после обновления iOS 26.4

If your mobile service does not work anymore after an iOS update, did you already force restart your iPhone?

Force restart iPhone - Apple Support

In case you haven't already, try to update to the latest iOS 26.5, which just has been released.

Did you already contact your carrier about this?

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Issues with your carrier or account might affect your service. Contact your carrier to:

• Verify that your account is active and in good standing.
• Make sure that you're in an area with cellular network coverage and there are no outages in your area.
• Check that your device isn't blocked or barred from receiving cellular services and is set up with the right data plan.
• Ask if your local government requires IMEI registration to use an iPhone that you originally purchased outside your country or region.

Only your wireless carrier can access and manage details about your account:

• iPhone wireless carriers

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copied from: If you see SOS, No Service, or Searching on your iPhone or iPad - Apple Support