I want to upgrade my iPhone 6

Hello ~ You can update to iOS 12.5.7 but no further. Click on the links below….

Update your iPhone or iPad - Apple Support

If your iPhone or iPad won't update - Apple Support

If you need a higher version of iOS you will need a newer iPhone. Click below to shop for a new device…

iPhone - Apple Official Site

If you purchase a second hand device please take a moment to read these helpful links by clicking on below to make an informed decision…

Activation Lock for iPhone, iPad, and iPod touch - Apple Support

Also:

The All Too Common SAD Reality of Buying a Used iPad/iPhone

~Katana-San~

Hello.

It looks like your iPhone 6 is on the latest software available for your phone, so you cannot upgrade the software any higher. If you want to physically upgrade, your iPhone 6 is not eligible for any trade-in value, but Apple will recycle it for free. You won't get any discount from your current iPhone 6, but you will get rid of it with Apple recycling it.

Hope this helps.

nattallie ~ iPhone 6 cannot be updated beyond iOS 12:

iOS 13 and iPadOS are compatible with these devices

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

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