Iphone Storage

The only way to increase the memory in your iPhone is to buy an iPhone with more memory in it. The only storage you can purchase is iCloud storage. You get 5GBs free. To buy more see Upgrade or downgrade your iCloud storage. iCloud storage is not the same as the memory on your iPhone. iCloud storage is sort of like an attached disk drive.

You can't increase the storage on an iPhone. But, Here is some information that should help you manage your storage.

iPhone:

How to check the storage on your iPhone, iPad, and iPod touch  https://support.apple.com/en-us/HT201656

How to free up space on an iPhone https://www.macworld.co.uk/how-to/iphone/free-space-iphone-3524712/

10 Easy Ways To Free Up A Lot Of Space On Your iPhone https://www.huffpost.com/entry/iphone-free-space-tips_n_6269756

iPhone Other storage: What is it and how do you delete it?

https://www.macworld.com/article/3388219/iphone-other-storage-what-is-it-and-how-do-you-delete-it.html 

Note that I would never optimize storage on an iDevice or a Mac. Others may argue for using this procedure.

iCloud:

Check your iCloud storage usage on iCloud.com https://support.apple.com/guide/icloud/check-your-storage-usage-mm6e5a441fc7/1.0/icloud/1.0

Manage your iCloud storage https://support.apple.com/en-us/HT204247

 Disk Space – Free Up    

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