IPhone :: 4 Won't Connect To Home WiFi

Up until recently I've had no issues with my iPhone 4, however, as of late, the phone can't detect my home WiFi network. I have several other devices that can find and connect to the network without issue, and have power cycled the router to be sure. the issue is most definately with the phone itself. iPhone has no issues connecting with public WiFi networks at McDonalds, Starbucks, nor the Airport. As far as iPhone is concerned, there is no WiFi networks to connect to in my home. I can't remember if this issue began before or after I installed 5.1 on my phone. I'd like to try all avenues before fully resetting the phone, as I have alot of data, settings and un-backed-up photographs, documents, etc. I'd rather not risk losing. So far, I have reset the phone (Hold Home and Power until phone resets.), Reset network settings, turned the phone on and off both with WiFi turned on and off to no avail. For the record, I have searched out and read alot of threads on this issue, and tried many if not all of the suggestions contained therein. Most of these issues pertain to iPhone not detecting ANY networks, or detecting but not connecting.

Info:
iPhone 4, iOS 5.1