I want to update my iPhone to iOS 13.4

If you have an outdated iPhone such as iPhone 4, 4S, iPhone 5 / 5c, it can’t be update to a higher iOS.

Check your iPhone type & iOS version -> Go to: Settings -> General -> About.

iOS 12.5.7 is the latest iOS security update for iPhone 5S / 6 / 6 Plus, can’t be update to a higher iOS (13 and later). 

Go to Settings -> General -> Software Update -> Download and Install (if you haven't already done that).

Check -> iPhone models compatible with iOS 12 - 16 ->

iPhone models compatible with iOS 16 – Apple Support (UK)

Yes, most apps require iOS 13.4 or later.                                

Considering a newer type of iPhone?

Read this before you buy a newer type iPhone.