set up eSIM on iPhone 13

Hello grmageek,

Thank you for using Apple Support Communities.

We understand you are interested in setting up the eSIM on your new iPhone 13 and want to know if you should migrate from the iPhone 12 first or set it up with the eSim. If you already have an existing phone number that you will be setting up on your iPhone, you can migrate from the old phone first and then set up the eSim. The following support articles will provide information on the migration process and also setting up the eSIM.

Transfer data from your previous iOS or iPadOS device to your new iPhone, iPad, or iPod touch - Apple Support

About eSIM on iPhone - Apple Support

Best regards.