Don’t show updates request
Don’t show software updates requests
iPhone 6 Plus, iOS 12
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iPhone 6 Plus, iOS 12
The last security updates for iPhone 6 Plus is iOS 12.5.6.
Go to Settings -> General -> Software Update -> Download and Install (if you haven't already done that).
iPhone 6 Plus is an outdated iPhone it can’t be update to a higher iOS (13 and later).
Yes, most apps require iOS 13.4 or later.
Considering a newer type of iPhone?
Read this before you buy a newer type iPhone.