To check the storage information on your iPhone, you can follow these steps:
Open the Settings app
On your iPhone, find and open the Settings app.
Go to the general settings
In the settings menu, find and click General.
View iPhone storage
In General settings, find and select iPhone Storage. In some versions of iOS, this option may be labeled simply as "Storage".
View storage details
On the iPhone Storage page, you can see the total storage capacity and available space of your device.
This page also shows how much storage space you've used, as well as what percentage of your apps and content (e.g., **, etc.) are using.
In some cases, you might be offered recommendations to optimize your storage space, such as deleting apps you don't use frequently or cleaning up message attachments.
Manage storage
On the same page, you can also manage your storage space. For example, delete apps or their data that you no longer need, clean up folders, and so on.
Cleaning up unnecessary files and apps regularly can help maintain good storage space management.
For iPhones with less storage space, you can save local storage space by taking advantage of cloud services like iCloud for storage** and backups.
The iOS system will do some automatic management of storage space on a regular basis, such as cleaning cache files, but manual management is still an effective way to keep storage space full.