The QR codes that provision the eSIM are single-use.
Most "real" carriers will of course let you migrate your eSIMs, with varying degrees of pain involved (my Japanese eSIM migrated automatically from iPhone to iPhone; the German one involved making a phone call); but ~all "travel plans" eSIMS will be single-use only.
The QR codes aren't really single-use, my carrier reuses the QR code and you can move devices by removing the eSIM from one and re-importing the QR code on the newer. (The QR code is invalid so long as the eSIM is provisioned on a device, not necessarily powered on)
The QR codes that provision the eSIM are single-use.
Most "real" carriers will of course let you migrate your eSIMs, with varying degrees of pain involved (my Japanese eSIM migrated automatically from iPhone to iPhone; the German one involved making a phone call); but ~all "travel plans" eSIMS will be single-use only.