IPhone 6+

You cannot pick and choose an iOS versions. 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 iPhone Model -->

• iOS 16.2 —>
  • Chipset A11 - 8 / 8 Plus / X
  • Chipset A12 - XR / XS / XS Max
  • Chipset A13 - SE (2020) / 11 / 11 Pro /11 Pro Max
  • Chipset A14 - 12 Mini / 12 / 12 Pro / 12 Pro Max
  • Chipset A15 - SE (2022) / 13 Mini / 13 / 13 Pro / 13 Pro Max
  • Chipset A16 - 14 / 14 Plus / 14 Pro / 14 Pro Max
• iOS 15.7.2 —>
  • Chipset A9 - 6S / 6S Plus /SE (1st Gen)
  • Chipset A10 - 7 / 7 Plus
• iOS 12.5.6 —>
  • Chipset A7 - iPhone 5S
  • Chipset A8 - iPhone 6/6 Plus
• iOS 10.3.4 —>
  • Chipset A6 - iPhone 5
• iOS 10.3.3 —>
  • Chipset A6 - iPhone 5C
• iOS 9.3.6 —> iPhone 4S - Chipset A5
• iOS 7.1.2 —> iPhone 4 - 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)

Is there a message on the screen? Unavailable? Security Lock? Activation Lock? Something else?

Have you contacted a carrier to set up cellular service on the phone and choose a connection plan? Assuming that the phone is actually working OK, nothing is going to happen until you have cellular service set up on the phone.

It may be water under the bridge at this point, but you purchased a phone that is essentially obsolete. I would return the phone for a refund if possible and look for an iPhone 8 or higher from a reputable dealer.....not an individual.

Ximenaaaaaa wrote:

hi , i just bought iPhone 6s+ and idk if it will still work since it’s old and I am afraid that the iOS version will stop renewing and my phone not to work anymore

The iPhone 6sPlus has reached the end of software support. The most current iOS version it can run, is iOs 15.7.1 and will not be able to update to iOS 16 or anything else. It may still get point updates for security patches for maybe 1 more year if that.

But yes that model is too old, and not a good purchase to have made if you except to use it for many years.

The 6s Plus has already hit the end of the line as far as software support goes.