IPhone Recognises All Wifi Networks Bar my Home Network

I have recently purchased a 32GB iPhone 4 (not 4S), and I have encountered the following problem: It will recognise most wifi networks promptly and without issue, but it does not recognise the one I use at home. Obviously this is a quite serious issue, as it is here that I will do most of my web browsing on my phone, and a stable wifi is needed to download apps. So without this I really have no recourse.
The problem in more detail:
I have been doing some research and, although some people have similar issues, my problem is unique. First, my phone does not even list the network in the wifi tab under 'choose a network'; second, I cannot add it by inputting the information for the network manually (it says 'Could not find the network 'X'); and third, it is not the case that this is a 'new' problem. I got the phone three days ago and it has never been able to recognise my home network. Apple and my service provider give me no help as it connects to all other networks I have encountered thus far.
All of these points lead me to believe that it is a problem particularly with my Network. However, it is not a hardware issue. In my household I have two desktop iMacs (both new) connected to this network, my three year old laptop, and two iPads (one first and one second generation). I have never had a problem with recognising the network or connecting to it on any of these devices; only the iPhone.
Additional information:
-This problem occured both under the operating system my phone came with (4. something) as well as the latest upgrade (5.0.1)
-The phone does have a 'Wi-Fi Address in system preferences
-The phone is indeed brand new
-The router I am using is a Cisco DPQ3925
-The channel width I am using is 20MHz
-I have my 'standard channel' set to 'Auto' (changing this makes me lose the network on all devices)
-The network is set to WPA2 Personal (not WEP, which seems to be causing some people problems)
-The SSID is indeed being broadcast
-This problem occurs regardless of how far I stand from the router
Attempted Solutions
-I have done a full restore to no avail
-I have restarted network settings on my iphone many times
-I have tried resetting the router with no luck
-I have tried turning on/off cellular data several times
-I have tried turning on/off location services several times
As mentioned, I assume the problem has something to do with the iPhone recognising the network settings. Some have suggested interference with other devices. I unfortunately have little experience fiddling with router settings, so I'll need to be walked through if this is the issue.
I eagerly await any possible solutions you would offer, and I am quite grateful in advance. I must say that this problem is very vexing. I have had my previous Nokia 3210 for over 10 years, and was quite resistant to upgrading. I am a Mac fanatic, and always want the newest models of PCs, but I have long resisted updating my phone for fear of problems just like this one. Please prove my phone troglodytism wrong!

I have an iPhone 4 and I do not have trouble with my wi-fi. I thought I would take the time to look at my router settings and see if there is something that I could find that differs. I use a Linksys WRT160N router, so that is one difference to start with, but that shouldn't be that big of a deal. I am using WPA2 Personal for security with a channel width of 20 MHz. Is there a possibility that you have MAC filtering on that would be preventing your device from connecting? Have you checked the Cisco website to ensure you have the most current software for the router? Which network mode are you using, B, G, N, Mixed? Are you able to connect to any other wi-fi network anywhere, a public one like McDonald's, Starbucks, your work? This would explain whether the wi-fi is good or there is a hardware problem with the iPhone.

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