what is the latest ios update

These are the iOS options based on iPhone Model --> You need to Identify your iPhone model - Apple Support

• iOS 15.1.1 ---> iPhone 12, 12 Mini, 12 Pro, 12 Pro max, iPhone 13, 13 Mini, 13 Pro, 13 Pro Max
• iOS 15.1 —> 6S / 6S Plus, SE (1st Gen and 2nd Gen), 7 / 7 Plus, 8 / 8 Plus, X, XR, XS /XS Max, 11,11 Pro /11 Pro Max,
• iOS 12.5.5 —> Final release supported on iPhone 5S, iPhone 6/6 Plus, 

Learn how to--> Update your iPhone, iPad, or iPod touch - Apple Support

The latest released iOS version is iOS 15.1 for iPhone 6s up to iPhone 11 and iOS 15.1.1 for iPhone 12 and iPhone 13.

Axel F.