Can a SIM card from an iPhone SE 1st gen be used in iPhone SE 3rd gen?
Can 1st gen SE SIM card be used in 3rd gen SE?
[Re-Titled by Moderator]
iPhone SE (Gen 3)
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Yes, it has the same nano size.
You need to change it if you want to change your traffic cellular plan to 5G network (if your carrier supports it).
Regards
Giulio