SIM Card Locked
My Sim card is locked on my iPhone 11 Pro and I have no Sim card in my iPhone SE
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Best reply
Contact your carrier for the SIM in the iPhone 11 Pro, and acquire a cellular plan for your iPhone SE.
If you are also seeking info on how to remove a carrier lock on an iPhone, contact the carrier holding the carrier lock.
Click on this link > How to unlock your iPhone for use with a different carrier - Apple Support