Do not install the same eSIM profile on two devices or assume its QR code can be reused. Installation and transfer rules depend on the profile and device.
Share a connection
If your plan and device support hotspot, the phone with the eSIM can share its data with another device. That traffic uses the same plan allowance. See "Share your connection with hotspot or tethering".
Independent connections
If both devices need their own connection, check each device's compatibility and buy a separate eligible plan for each. You can keep purchases in the same SimFuse account.
Changing phones
Keep the eSIM installed on the old phone while support checks whether transfer, reinstallation or a replacement is possible for that specific eSIM. Phone-to-phone transfer features do not guarantee support for every travel eSIM.
Do not delete the old profile or scan its code on the new phone as a test. See "Deleting an eSIM, and when not to".