IPhone 4 iOS 6 Update Doesn't Support 5GHz WiFi?

After upgrading to iOS 6 on my GSM iPhone 4, I've discovered that I can longer access my Apple Time Capsule (Airport Extreme). I do not have the grayed-out wifi option, but rather I can only see wifi base stations in the 2.4Hz spectrum. My Time Capsule is set for 5GHz only to eliminate interference from the large number of wifi access points in the surrounding area. Fortunately i have a Motorola witeless Cable Modem so i am able to access wifi in the 2.4GHz spectrum directly. However, using the AirPort App, I am able to see my Time Capsule, which should not be the case since it should only be visible to devices that can see 5GHz. This is based on my own previous attempts to reset the Time Capsule after setting it to 5GHz only and discovering none of my devices at that time were 5GHz capable.
The iPhone 4 was actively accessing the 5GHz Time Capsule prior to my upgrade to iOS 6. Does the fact that the AirPort App can see the Time Capsule, but can't see the 5GHz network hosted there suggest anything about the settings that may need to be adjusted following the upgrade to iOS 6?
I've read that the grayed-out WiFi option has resulted in some iPhone 4S being replaced under warranty, but obviously my phone is considerably out of warranty at this point. So I am concerned that this is a software fix coming in the next update. While the majority of Wifi access spots are still 2.4GHz, more are moving to the 5GHz spectrum, and I would hate to lose that functionality just to gain a few unspectacular features under iOS 6.
Anybody else have this specific problem, as I have searched and found nothing. most problems seem to affect only the 4S?

I don't understand your question: the iPhone 4 doesn't -- and never has -- support 5ghz wifi. See http://www.apple.com/iphone/iphone-4/specs.html

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