iphone - 320x480 div, how to make it scale on all phones? -


at moment i'm using following viewport code 320x480 portrait phone ad:

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

for me, scales on iphone3, iphone3gs, iphone4, iphone4s, iphone5, samsung galaxy s3, sony erricson phone , on

the agency serving these ads need work on phones , tell it's not scaling, wont offer devices wont scale on :/

is there else can in regards meta viewport tag ensure scales width of device?

thanks

try 'opera mobile emulator'. can find series of various mobile device testing environment different screen width. helps while developing responsive sites


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