what to do in iphone fit all the layout in screen - getting smaller?
<meta name="viewport" content="width=device-width, maximum-scale=1.5" />
If you are not using media queries to deliver alternate styling to smaller devices then don't use a viewport meta tag at all.
The viewport meta tag only makes sense if you have supplied screen width media queries so that smaller devices get a better experience. If you are not doing this then you don't need the meta tag and the device will scale the page smaller to fit. However it will look very small and users will have to zoom to read it properly. There is no quick fix but to do it properly from the start I'm afraid.
More info here: