Can I purchase a 11 pro and insert the sim from a XS

Hey Kcornett09,

Welcome to the Apple Support Communities! Thanks for your question about being able to purchase a SIM-Free iPhone. I'd be glad to get you pointed in the right direction.

You can look over the options on the Buy iPhone 11 Pro page. Some regions do offer a Sim-Free iPhone where you can just insert the one you have, or you can set up a carrier when you make your purchase.

For any other questions you might have about making a purchase, be sure to visit Contacting Apple and use the number under Apple Online Store.

Take care.

Yes, they use the same size SIM card as indicated in https://support.apple.com/en-us/HT202645