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I'm doing some research on the way to use a certificate from a SIM Card (in order to keep the service provided, if the user wants to change his phone).
In Android, it seems OK, but I can't find anything in the iOS platform: is it possible to read X.509 certificates from the SIM card through an iPhone device?
No.
Your best bet is to use either the Keychain or iCloud to persist data between devices.