How to change phone number from existing iPhone 8 to existing
How to change phone number of existing iPhone 8 to existing iPhone 11
iPhone 8, iOS 16
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Hello!
To move your phone number to a different device, you can take the SIM card out of your iPhone 8 and move it to your iPhone 11. You won't have to worry about eSIM as that is in iPhone 14 and (I'm assuming) the newer models to come.
NOTE: Moving the SIM from an iPhone 8 to an 11 may not be compatible, you can test it to see. PLEASE, do NOT use the old SIM tray in your iPhone 8 on your 11, as that will not work. The guide below specifically states that.
Check out this Apple Support guide on how to move your SIM card to another phone. Remove or switch the SIM card in your iPhone - Apple Support