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My iPhone SE was just upgraded with ios 12.1.2, but the cellular network is now dead. After restarting it, I got this message

Cellular Update Failed

Your iPhone cannot make and receive calls or access cellular data until it has been updated.

Learn More / OK

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2 Answers 2

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Per this recent Apple Support page, you need to bring the iPhone to a Genius Bar or other authorized Apple repair place to have it fixed.

You can also contact Apple Support to discuss your options.

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  • Thanks @fsb, unfortunately I don't live in the US to bring the phone to a Genius Bar, and authorized resellers are not so good in my country, so that's going to be my last resort.
    – j2gl
    Dec 21, 2018 at 18:24
  • I think that's your only resort. All the research I did said you need to take it in to be looked at. You can try contacting Apple Support directly from the link in my answer.
    – fsb
    Dec 21, 2018 at 19:19
  • Thanks, for your help. It looks like I'm not the only one, see this article from yesterday in forbes.
    – j2gl
    Dec 22, 2018 at 16:57
  • Yea, this is not the first time this problem has happened, either. I was seeing articles from last year with the same problem.
    – fsb
    Dec 22, 2018 at 17:01
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You need to update your cellular settings.

How to do so from this Apple Support page:

  1. Make sure your device is connected to a Wi-Fi or cellular network.

  2. Tap Settings > General > About. If an update is available, you'll see an option to update your carrier settings.

If there is no option or it doesn't work then:

If you see either of these alerts, take your iPhone or iPad to an Apple Authorized Service Provider or make a Genius Bar reservation at an Apple Store. You can also contact Apple Support.

According to this Apple Support page.

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