Re: imessage stops working after change of SIM

badgolferman wrote on Fri, 9 Aug 2024 12:32:29 -0000 (UTC) :

What's gone wrong and how to fix please?
 

 
Maybe when the SIM was replaced the iMessage function was disabled. Check
under Settings / Messages / iMessage toggled on.

As badgolferman kindly noted, it's a commonly asked question, where the
first amelioration in most of the articles I saw was similar to his kind
advice.

Take note that you ported a number which may have added/removed a
complexity.

https://community.idmobile.co.uk/ask-a-question-18/imessage-not-activating-after-number-port-56256
Add the number you want keep to your AppleID:
Go to Settings > Name, Phone Numbers, Email > Contactable At
Choose Edit
Enter your correct number, using +44 instead of the first 0
Tap Save
Reset iMessage settings:
Go to Settings > Messages
Toggle iMessage to OFF and then back to ON
Once iMessage has been activated, scroll to Send & Receive to check if the
right mobile number is ticked
Reset FaceTime settings:
Go to Settings > FaceTime
Toggle FaceTime to OFF and then back to ON
Once FaceTime has been activated, scroll down and check if your mobile
number is ticked under You can be reached by FaceTime at

https://productioncommunity.publicmobile.ca/t5/Get-Support/Transferred-SIM-to-new-iPhone-and-not-working/td-p/753000
Go to Settings > Messages and make sure that iMessage is on. You might need
to wait a moment for it to activate.
Tap Send & Receive. If you see "Use your Apple ID for iMessage," tap it and
sign in with the same Apple ID that you use on your Mac, iPad, and iPod
touch.
In the "You can receive iMessages" section, make sure that your phone
number and Apple ID are selected.
Go to Settings > FaceTime and make sure that your phone number and Apple ID
are selected in the "You can be reached by FaceTime at" section.

https://helpforum.sky.com/t5/Sky-Mobile/Imessage-facetime-not-working-on-number-transfer/td-p/4486904
Go to settings, message, send receive
Tap on Apple ID and sign out.
Turn iMessage off.
Turn your phone off for at least 10 seconds
Go to settings, message, iMessage turn back on
Tap on send receive and sign in to Apple ID
Make sure correct number showin in "start new conversations from"

Sometimes it just takes a day or two...
https://community.o2.co.uk/t5/Apple/iMessage-won-t-activate-after-number-port/td-p/1617814