iOS upgrade
How can I upgrade my iPhone 6 iOS version to latest iOS version?
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iOS 12.5.7 is the latest iOS security update for iPhone 6.
Go to Settings -> General -> Software Update -> Download and Install (if you haven't already done that).
iPhone 6 can’t be update to a higher iOS (13 and later).
Most apps require iOS 13.4 or later.
Considering a newer type of iPhone?
Read this before you buy a newer type iPhone.