How can I make a horizontal picture fit for an iPhone background?

I want to put this one picture as my iPhone background, but it's horizontal, not vertical. When I try to or it as my background it just zooms into the picture and I can't set the whole pic as my background

Crop it.

The other answer is correct. Edit the pic and crop it so you get your favorite part to fit. I have done this many times, often choosing a nice photo from a recent vacation, or beautiful plants from my garden. When it is gray and icy here, having a pic of my front porch with two cascading petunias is sure nice.

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