EA4500 - Hardware requirements to use the 5.0 GHZ network?

My two devices access the 2.4 ghz wireless network fine on my EA4500.
Both my devices, laptop and iPhone4, have N rated network cards. 
What do I need to use the 5.0 ghz wireless network on the EA4500?
Can the iPhone4 use a 5.0 wireless network?
When I try to add the 5.0 ghz Wifi to my iPhone4, it cannot find the named but hidden SSID network??

Iphones don't have 5 Ghz.   Ipad2 and new ipad do have 5 GHz.  The iphone that is going to be released next month is supposed to have 5 GHz.
The easiest thing to do is use google and research your devices capabilities.

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