Why is the old Apple phone full?

First, install the old version of the software through iTunes.

The apps in the Apple App Store are all the latest versions. If you want to download the old software from Apple App Store, you can't, but we can download the old software through other channels, such as iTunes software installation.

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If we usually back up the software on Apple's mobile phone through iTunes, we can restore the old version of the software installed before by restoring the backup.

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Or you can download the old version of the software before installing iTunes and check whether there is any software before the old version in the iTunes update. (Note: Do not click Update Application)

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Then all we have to do is connect the iPhone to iTunes, and then select the old version of the software in the application to install.

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Second, download and install through other Apple applications.

In other Apple applications, there are often some software updates that are slower than the Apple App Store.

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If there are still old versions of software on these applications, download and install the old version of Apple software in this way before the software is updated.

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Summary: downloading the old version of Apple's software may be incompatible with Apple's system, so when downloading, you should pay attention to which system version of Apple the software currently supports to avoid the situation that the software cannot be used after downloading.