Storage

Renting iCloud storage does not add storage space to an iPhone. If you need additional space on the device, you will need to delete or move existing content.

What's the difference between device storage and iCloud storage? - Apple Support (CA)

Your phone will always have the amount of storage it came with. You have bought space in Apple's synching service, iCloud. See this link...

What's the difference between device storage and iCloud storage? - Apple Support

The only way you can gain space is to delete photos, messages, apps, etc.. Be sure to save important photos and data to your computer or an external drive. this video may help...