You can make a difference in the Apple Support Community!

When you sign up with your Apple Account, you can provide valuable feedback to other community members by upvoting helpful replies and User Tips.

Looks like no one’s replied in a while. To start the conversation again, simply ask a new question.

User profile for user: jamesbfg
jamesbfg Author
User level: Level 1
17 points

iOS 15.4 - iMessage won't active. Error message - "An error occurred during activation."

Hi all, I've just updated to iOS 15.4 and my iMessage has stopped working. I didn't turn it off but it stopped functioning on my iPhone (still works on my Mac).


I have tried

  • Restarting (hard reset) iPhone with iMessage off and then turning it on again.
  • Turning iMessage on and off again, but I get an error message - "An error occurred during activation."
  • I have tired turning on/off Airplane mode.


None of these have worked. A little worried it's a bug in iOS 15.4 as I didn't have any issues before. Any ideas greatly appreciated.

iPhone 12 mini, iOS 15

Posted on Mar 17, 2022 6:52 AM

Reply
Question marked as Top-ranking reply
User profile for user: razmee209
razmee209
User level: Level 10
193,680 points

Posted on Mar 17, 2022 9:52 AM

jamesbfg wrote:

• Hi all, I've just updated to iOS 15.4 and my iMessage has stopped working. I didn't turn it off but it stopped functioning on my iPhone (still works on my Mac).

I have tried
Restarting (hard reset) iPhone with iMessage off and then turning it on again.
• Turning iMessage on and off again, but I get an error message - "An error occurred during activation."
• I have tired turning on/off Airplane mode.

None of these have worked. A little worried it's a bug in iOS 15.4 as I didn't have any issues before. Any ideas greatly appreciated.

Follow ALL steps here If you can’t turn on or sign in to iMessage or FaceTime - Apple Support

View in context

Similar questions

50 replies
User profile for user: beatleman777
beatleman777
User level: Level 1
4 points

May 4, 2022 9:49 AM in response to jamesbfg

Just wanted to add one more thanks to JustJarred as his solution worked.


Removed cellular plan, called T-Mobile, and had them add the EID back in. Took about a 30 minute call. Restarted the phone and it said T-Mobile has a plan to add and now it’s working again. Make sure you have your numbers handy (EID and your IMEI2 as they asked for both) and make sure you know the T-Mobile account’s PIN number and call from a separate line as earlier posts have advised.


Definitely learned my lesson and will never say no to carrier settings updates. :-)


Good luck, all!

Reply
User profile for user: thejohnisjohn
thejohnisjohn
User level: Level 1
6 points

May 17, 2022 1:06 PM in response to Trevozneoma

I too have had the imessages/ios 15.4/e-sim problem since March. Countless nights on the phone with support. Tired of the back and forth between Apple sending me to T-Mobile for support I just sort of gave up (even though the issue was maddening) and hoped that the next update would fix it. Today, after downloading 15.5 the issue persisted so i stopped at the T-Mobile store and had them instal a physical sim card and the issue hasn’t returned since.

Reply

iOS 15.4 - iMessage won't active. Error message - "An error occurred during activation."

Welcome to Apple Support Community
A forum where Apple customers help each other with their products. Get started with your Apple Account.
Learn more Sign up