How do I install iOS 26 on my iPhone 12 mini?

It's not yet available to the general public. If you're part of one of Apple's testing programs, it provides installation instructions; questions about them should be directed to its staff instead of here.

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iOS 26 hasn’t been released to the general public yet. It is currently only for Developers testing. When it is released in the fall, your iPhone 12 mini will receive it.