I can't cancel the iCloud storage plan
I am trying to cancel the iCloud storage plan that we no longer have the device that was using it.
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You can use any device that is signed into the same Apple ID -- the storage plan is linked to your Apple ID, not to a specific device. If that doesn't help and the instructions in Downgrade or cancel your iCloud+ plan - Apple Support don't help, see the following from those instructions:
If you still need help, contact Apple Support.