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

Jan 19, 2024 8:59 AM in response to KoraBorealis

KoraBorealis wrote:

Update 17.2.1 installed last night and my iphone 14 has frozen. Touch screen does not work and attempting to restart it makes a call to emergency services. I can't attempt any of the solutions when my iphone wont respond. AAAARRRRRGGGGGHHH!

On the upside I can at least stop alarms using Apple watch.
  • Press and quickly release VOLUME UP


     then

  • Press and quickly release VOLUME DOWN


     then

  • Hold the SIDE button until an Apple logo appears (15-30 seconds), ignoring "slide to power off" if it appears


The operative word here is QUICKLY; 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. 


Jan 19, 2024 9:18 AM in response to Ohhhmymy

Apple actually did reach out to me after reading the comments I posted here right after news stories citing this discussion thread appeared in the US and India. At that point, between reverting to 17.2 (which can't be done anymore), then being forced to upgrade back to 17.2.1 to restore a backup, and working with t-Mobile second-tier support, things worked. FOR ONE DAY!


We are shopping for Android at this point. Way too much nonsense. 17.2.1 breaks connectivity, if not the phone itself.

Jan 24, 2024 12:25 PM in response to Hedgehog64

Same with my Iphone 12, after update it keeps searching for service. I removed the sim card (which works in another phone), and continues searching service. I tried to update it in many ways, to the point I got now with an activation error. I had a call with an apple senior assistant and they said the new update might recognise an error in the hardware that the previus software didn't (doesn't make any sense at all). Now, after factory reset it fails to activate. anyone else with this issue?

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iPhone not working after 17.2.1 update

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