The "Unable to Complete Cellular Plan Change" error message is an error that may appear when attempting to switch to a new eSIM data bundle on your device. There are several reasons why this error message may appear.
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Poor network connection - A weak or unstable network connection can cause the eSIM data bundle to change or fail. Ensure you are in an area with good coverage and are connecting to a network covered by the data bundle.
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Carrier restrictions - Some carriers may have restrictions on eSIMs that can be added to a device. Ensure that the eSIM plan you are attempting to switch to is compatible with your device and carrier and that your device is not carrier locked.
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Incompatible device - Not all devices are compatible with eSIMs. Check that your device model is compatible. Ensure that you check the region of the device manufacture for any specific or local restrictions on the device.
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Device-related issues - There may be issues with your device that are preventing the eSIM data bundle change from completing.
If you are experiencing this error check the items above. If the error persists you may try turning airplane mode on and off, this will ensure any data sessions into the network from your device are reset.