Touch emulation utility:
iPhone 4 and his successor, the iPhone 4S, are equipped with the same multitouch screen size - 3.5 inches and a resolution of 640x960 pixels at 326 ppi pixel density. The default web browser on both phones is a mobile version of Safari, like in all Apple devices equipped with a web browser.
iPhone 4 has not received the update to the latest iOS version 7, so the mobility test of websites on mobilewebtest.eu for these devices uses two application user agent:
Viewport for iPhone 4 and iPhone 4S in portrait mode: 320 px
Viewport for iPhone 4 and iPhone 4S in landscape mode: 480 px
When testing the website with a dedicated mobile version of redirecting web address, ensure that the redirect code in your site correctly recognize these references used by the user agent mobility test web mobilewebtest.eu