I bought storage but my phone is still on the same size
i bought storage but my phone is still on 16Gb
iPhone 6s, iOS 14
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The answer is in the document linked at the top of the page: What's the difference between device storage and iCloud storage?
Read it to understand the difference between the storage capacity of your device (it cannot be changed) and the space you are renting on Apple's servers with your iCloud+ subscription.