I want to update my phone

Update your iPhone, iPad, or iPod touch wirelessly

1. Back up your device using iCloud or your computer.
2. Plug your device into power and connect to the internet with Wi-Fi.
3. Go to Settings > General, then tap Software Update.
4. If you see two software update options available, choose the one that you want to install.
5. 

Tap Install Now. If you see Download and Install instead, tap it to download the update, enter your passcode, then tap Install Now.

Olusoji ~ iPhone 6 cannot be updated beyond iOS 12:

iOS 13 and iPadOS are compatible with these devices

iOS 14 and iPadOS are compatible with these devices

iOS 15 and iPadOS 15 are compatible with these devices

...found by searching Apple's Knowledge Base.

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