The error message "Cellular Plans From This Carrier Cannot be Added" typically appears on a mobile device when attempting to add a new eSIM or data bundle from a carrier that is not supported by the device. This message can occur for a range of reasons.
Incompatible device - Some eSIMs only support certain types of devices. If your device is not compatible you may receive this error message.
Device locked to a carrier - Some mobile devices are locked to a specific carrier meaning they can only be used with that carrier network SIMs and plans. If your device is locked to a different carrier than the one you are attempting to add an eSIM for, you may see this error.
Carrier restrictions - Some carriers may have restrictions on the types of eSIMs and data bundles that can be added to a device. For example, they may only allow post paid plans and not prepaid plans.
If you are receiving this error message, you should contact your device providers customer support for assistance. They may be able to provide additional information about why the error is occurring and what steps you can take to resolve it. This may be as simple as a device unlock.