Update software iPhone 6s

Follow the instructions in this link→Update your iPhone, iPad, or iPod touch - Apple Support

In addition, note the following - To update over the air from the phone all of these requirements must be met:

• You need at least 6 GB of free storage
• You must be connected to a Wi-Fi network (and not a personal hotspot)
• The phone must be charged to at least 50%, and preferably plugged in so it stays above 50% during the update
• The phone must not be in Low Power Mode
• The phone must not be connected through VPN
• The phone cannot be in Airplane mode
• You cannot still have a beta version installed on the phone

If you can't meet all of them you can still update using your computer.

Start here: https://support.apple.com/en-us/HT204204.

Use a computer or the Software Update function in Settings. If you encounter a specific issue, describe it in this thread.

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