Why does this website not scale to fit on the iphone on load?

The client is complaining that the site doesn't fit in an iphone screen, how come other websites rescale to fit the scree开发者_如何学Gon but the site below doesn't?

http://berrisford.gumpshen.com/

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Because it has a viewport meta tag which doesn't allow so:

<meta name="viewport" content="width=device-width; initial-scale=1.0; maximum-scale=1.0; minimum-scale=1.0; user-scalable=0;" />