Where is it sending the confirmation code for deregistering imessage
Deregistering iMessage from a iPhone I no longer have says it’s sending a confirmation code but where is that going to?? My email? Another phone?
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It sends the code to the SIM card associated with the iMessage account you wish to de-register.
Why do you want to de-register? de-register is only done when you want to use the same SIM on a non-iOS device.
If you have it with you and want to use it with an Android device then put the SIM on any Phone (Apple or Android) and follow the GIF
Insert the same SIM into an Android or an iPhone. You may deregister iMessage online
Watch the GIF below. Here I have used another iPhone for the demo but for you, it may be your choice. Android or iPhone device.