Encountering the error message “Cellular Plans From This Carrier Cannot be Added” often indicates an attempt to install an eSIM on a device that is restricted by a network lock.

To determine if your device is subject to such a lock, you can perform a simple check with these steps:

1. Navigate to Settings, select General, and then tap on About.
2. Look for the Carrier Lock section. A status of “No SIM restrictions” means your device is unlocked. If this message is not displayed, reaching out to your current carrier for assistance in unlocking your device is advisable.