iPhone not working after 17.2.1 update

After updating my iPhone last night to 17.2.1 I can no longer connect to my network provider. Tried the resets and still it does not work!

very frustrating.

Trusted Apple and iPhone for years, now not so sure

Posted on Dec 21, 2023 8:24 AM

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Posted on Dec 28, 2023 10:22 AM

Solved my problem after 8 hours of troubleshooting! After the 17.2.1 update, my iPhone 14 Pro Max would not send or receive calls and got hot from accelerated battery drain. First AppleCare walked me through hardware diagnostics, network resets, backups and restores but the problem persisted. Next, Verizon helped me with a new eSIM, but the problem continued. Next, I focused on my company's corporate software, because I was intrigued by the VPN discussion in this forum. While I don't use a VPN, my iPhone is managed by my company's installation of Microsoft InTune, which I noticed (Settings:General:VPN & Device Mgmt) had a signing certificate (IOSProfileSigning.manage.microsoft.us) that had expired December 12, 2023. To test this theory, I removed this Management software and my phone's cellular calls worked perfectly again! So for the final steps, I worked with my company's IT department to reinstall the Management software, which has an updated IOS signing certificate, and the phone is now back to normal. Sharing in case others find my painful tech journey useful.

370 replies

Dec 24, 2023 2:01 PM in response to Hedgehog64

I’m facing the exact same problem after updating from iOS 16 to iOS 17.2.1. I do not have any VPN connection set up or whatsoever and my cellular data is completely broken which is a HUGE inconvenience on this holidays.


This is unacceptable. What concerns the most is that I swapped my SIM with an old spared iPhone I have and the connection is still nowhere to be found. I truly hope the update didn’t mess something up with the SIM’s OS.

Dec 29, 2023 7:08 AM in response to Alexd666

Alexd666 wrote:

So the real question is, is there a reason for us to sit and complain here? Would Apple really fix this or they just watch us complain? I’m new to this. I’ve had this issue for 11 days now.

Apple is not watching you complain. This is a user-to-user forum, and only other users are watching you complain. If you want to hear from Apple contact Apple support; you can click on “Support” at the top or bottom of this page.


Or you can read the thread you posted to, and see how others have dealt with this symptom. Or both.

This thread has been closed by the system or the community team. You may vote for any posts you find helpful, or search the Community for additional answers.

iPhone not working after 17.2.1 update

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