I phone xr to i phone 15 pro do i need a new sim card or will the old sim work o

[Katie_B]

Hello @Alland12 

I believe your SIM that is being used in the iPhone XR will work in your new iPhone 15 Pro. 

Katie 🙂

[bristolian]

Apple support list the SIM size required for every iPhone - https://support.apple.com/en-gb/HT202645