I want to upgrade my iPhone 6s

Hello,

There are different ways to ensure the highest iOS that your device will support is installed on your device. For an iPhone 6S or 6S Plus that's iOS 15.7.8 14 is no longer available.

This support article has instructions about updating an iPhone or iPad wirelessly —> Update your iPhone or iPad - Apple Support

You can also use Mac and PC computers to update system software, as described in this article —>

Update iOS on iPhone - Apple Support

When updating, your device will update to the highest version currently available that it will support, or it will just say it is up to date (and can't go any higher) and won't install anything. If you want to run a higher system version than your current device will run, that you need to buy a newer device.

Sorry, but you can only update an iPhone to the “current” iOS appropriate for any particular model.

For your 6s that is 15.7.8

See “how” here:

Update iOS on iPhone – Apple Support (AU)

Jialissa Said:

"I want to upgrade my iPhone 6s: I want to upgrade my iPhone to 14.7"

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For Future Reference...

Updating an iPhone:

Determining if an Update will Install:

How to do so...

A. Verify Compatibility:

Identify your iPhone model. The first thing that comes to mind in incompatibility being the culprit. So, confirm the model of your iPhone. If iPhone model is incompatible with iOS 16 then it is because you iPhone does not meet the hardware requirements for this iOS version(s).

B. If Compatible...

1. Back Up First:

IMPORTANT: If you have an option to update, however, then be certain you backup your iPhone first. That way, you will have something to restore your iPhone from should anything go wrong with the update

then...

2. Proceed with the Update:

• Use my User Tip:  Update your iPhone Using a Computer - User Tip

To update to the most recent, compatible version of iOS, please see: Update your iPhone, iPad, or iPod touch - Apple Support

And: If your iPhone, iPad, or iPod touch won't update - Apple Support

If the above Apple articles do not help, please post back with relevant information.