Do I need to switch my SIM card to my new phone?
Do I need to switch my SIM card to my new phone?
iPhone 12 Pro, iOS 14
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That depends. If you had your carrier setup your service on the new iPhone, or used the in iPhone setup option to do so, then no.
If you had not yet set up service, then yes, you can transfer the SIM card to immediately get your cell service active on the new iPhone.
link-> Set up cellular service on iPhone - Apple Support