The one thing I find that does not survive a SIM swap is DIGITS - you have to set it up again after swapping SIMs. This is the case even when you have DIGITS in data only mode, where the changing of the SIM really should not make a difference. I assume, if that is intentional, it is a security measure.
Originally Posted by
Michael Ad
I think it has to do with how your iMessage is configured. If it's based solely on your phone number, it breaks. But there are reasons to keep it unrelated to your email addresses.
If you, however, have it related to your email addresses also, I believe it will survive a SIM swap.