IOS 16 update for my iPhone 6s plus

You cannot pick and choose an iOS version. What you get is Settings > General > Software update > [All options are available here]

You need to correctly Identify your iPhone model - Apple Support

These are the iOS options based on an iPhone Model

(Updated Jan 4, 2025 12:05 PM)

• iOS 18.2.1 —> iPhone models compatible with iOS 18
• iOS 16.7.10 —> iOS 16 and iPadOS 16 are compatible with these devices
  • Chipset A11 - 8 (2GB RAM) / 8 Plus (3GB RAM) / X (3GB RAM)
• iOS 15.8.3 —> iOS 15 is compatible with these devices.
  • Chipset A9 - 6S (2GB RAM) / 6S Plus (2GB RAM) / SE (1st Gen) (2GB RAM)
  • Chipset A10 - 7 (2GB RAM) / 7 Plus (3GB RAM)
• iOS 12.5.7 —>
  • Chipset A7 - iPhone 5S (1GB RAM)
  • Chipset A8 - iPhone 6/6 Plus (1GB RAM)
• iOS 10.3.4 —>
  • Chipset A6 - iPhone 5 (1GB RAM)
• iOS 10.3.3 —>
  • Chipset A6 - iPhone 5C (1GB RAM)
• iOS 9.3.6 —> iPhone 4S (512MB RAM) - Chipset A5
• iOS 7.1.2 —> iPhone 4 (512MB RAM)- Chipset A4

Know how to...

• Update Over-the-Air (OTA) —> Update your iPhone or iPad - Apple Support (IN)
• Update using iTunes/Finder —> Update your iPhone, iPad, or iPod touch - Apple Support (IN)

Sorry but no matter how much you want iOS 16, It’s not gonna come on your current iPhone. Your iPhone 6s Plus has reached the end of its software updates support for the latest iOS operating system, and cannot be updated past iOS 15.8.3.

In fact, the iPhone 6s lineup are the longest supported iPhones ever released. They went through seven major iOS versions. While your iPhone has lasted a while, it’s about time for an upgrade. You have already noticed that most modern apps you want to run on it won’t be compatible.

"IOS 16 update for my iPhone 6s plus Hi team, can i request please update ios 16 to my iphone 6s plus payment please I really need it for okta verification for my work."

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iPhone 6 Plus Only Goes to iOS12.5.3:

Your iPhone model (iPhone 6s Plus) is incompatible with iOS16. This is because it does not meet the hardware requirements for it. So, take this as a good reason to upgrade. Apple typically grants update for 7 years after the date of releases and then ends them. If any update is created afterwards, it might be for pandemics, such as those created for COVID health concerns.