Purchase of icloud storage

iCloud storage does NOT magically increase the amount of local storage on your phone. The only way to do that is to delete apps and data that you no longer need. You can not increase the total internal storage beyond what it shipped with from the factory.

iCloud storage is independent of iPhone storage. You can’t purchase more storage for your phone. If you need space on your phone, you will need to delete something.

Extra iCloud storage is a monthly rental and not a purchase.

You can't add to the storage capacity on any iOS device.

The only way to make more more room on your device is to remove things from it.