iPhone 6not are support 14.4

iPhone 6

iPhone 6 is an outdated iPhone it can’t be update to a higher iOS (13 and later).

The last security updates iOS 12 5.7 -> released September 12, 2022, available for: iPhone 5s, iPhone 6, iPhone 6 Plus, iPad Air, iPad mini 2, iPad mini 3, and iPod touch (6th generation)

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

Go to Settings -> General -> Software Update -> Download and Install.

Yes, most apps require iOS 13 or later.                                

Considering a newer type of iPhone?

Read before you buy a newer iPhone: 

The All Too Common SAD Reality of Buying a Used iPad/iPhone

The All Too Common SAD Reality of Buying … - Apple Community

Apple Store -> iPhone - Buying iPhone - Apple

Apple Certified Refurbished -> Refurbished iPhone - iPhone 12 Pro - Apple