I won’t to upgrade my iPhone
Can I upgrade my iPhone
iPhone 7, iOS 13
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Hello ~ Take a look here by clicking on the links below…
Update your iPhone or iPad - Apple Support
If your iPhone or iPad won't update - Apple Support
You may update your iPhone 7 to iOS 15.7.4 but no higher. If you need a higher version of iOS you need a newer iPhone.
If you consider a second hand iPhone please take a moment to read this…
Activation Lock for iPhone, iPad, and iPod touch - Apple Support
Also:
The All Too Common SAD Reality of Buying a Used iPad/iPhone
~Katana-San~