I can’t update my iphone 6s

Update your iPhone, iPad, or iPod touch wirelessly

1. Plug your device into power and connect to the internet with Wi-Fi.
2. Go to Settings > General, then tap Software Update.
3. If you see two software update options available, choose the one that you want to install.
4. Tap Install Now.

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Akashbiswas Said:

"I can’t update my iphone 6s: I can’t update my phone"

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To Check for Updates:

Use a Computer and Ethernet:

Start with attempting an update through use of a computer. If you cannot use Wi-Fi, then use Ethernet.  Go Here: Update your iPhone Using a Computer - User Tip. On the computer, you would connect it through Ethernet, going directly into your router. For a Mac (or PC) that does not have Ethernet, this would be the adapter to use: Belkin USB-C to Gigabit Ethernet Adapter - Apple. If you get the same error, the model is likely just not compatible.

What happens when you attempt to update?

Any error messages?

What is the existing version of iOS?