How to get rid of your storage
How to get rid of storage for free
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It's not clear to me to what kind of storage you are referring. Storage on a device is fixed and cannot be altered after you buy a device. iCloud storage is flexible and varies according to the plan you choose.
Read this support article about how to downgrade or cancel your iCloud+ storage plan on an Apple mobile device, a Mac, or a PC. --> Downgrade or cancel your iCloud+ plan - Apple Support