how to buy more storage?

princesca Said:

"how to buy more storage?: My phone is getting slow because of low storage and i would like to have more"

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Caches may have intensely uploaded. So, clear them.

Troubleshooting iPhone Storage:

Internal storage cannot be upgraded. It is what it is. So, the maximum internal storage capacity never increases, even if you upgraded your iCloud plan. Learn More here: What's the Difference Between Device Storage and iCloud Storage? Apple Support

So, what to do...

Clear Space Using my User Tips:

• How to Clear Space from your Mobile Device, and What to Clear: - User Tip
• How to Clear "Other" in your iPhone's Storage - Use Backup - User Tip

You cannot increase the storage on your phone. You will have to delete apps, videos, photos and other data.

~Lyssa

You cannot get more physical storage on an iPhone but you could shift files you don't use to iCloud if you have a subscription.