How to get more storage space for my iPhone?

Tatumst wrote:

I need more storage space to backup iPhone 12

You need to increase your iCloud Storage space:

Upgrade to iCloud+ - Apple Support

Tatumst Said:

"How do I get more storage space: I need more storage space to backup iPhone 12"

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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. You may have too much installed, and need to clear space. So, see my user tip: 
• How to Clear "Other" in your iPhone's Storage - Use Backup - User Tip. Caches would be being used for remembrance of application use. It is essentially the same for an iPhone. You'd backup your iPhone, and then restore your iPhone from the backup you've just created. All System Data will delete.

Tatumst Said:

"How do I get more storage space: I need more storage space to backup iPhone 12"

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Troubleshooting iCloud Storage:

Upgrading iCloud:

• Upgrade iCloud on a Computer: Perform this on a computer, as it would be more user-friendly doing so.

One Alternate...

• Download All of iCloud:

Save a Few: If you wanted to, rather than upgrading your iCloud plan, you could export all of iCloud onto an external drive > verify you can access the data > trash iCloud storage > and then start iCloud anew.  Read my User Tip for more: Getting a Quick and Direct "iCloud Drive-to-External Hard Drive" Download - User Tip

Use iMazing is the best option you can do.

https://imazing.com/guides/getting-started-with-imazing#how-does-imazing-work