How to update to solve issues with App Store?
Update my phone issue in my apple store
[Re-Titled by Moderator]
iPhone 6, iOS 12
Hello ~ You can update to iOS 12.5.7 but no further. Click on the links below….
Update your iPhone or iPad - Apple Support
If your iPhone or iPad won't update - Apple Support
If you need a higher version of iOS you will need a newer iPhone. Click below to shop for a new device…
If you purchase a second hand device please take a moment to read these helpful links by clicking on below to make an informed decision…
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~