IPhones WiFi Connection Suddenly Stopped Working

Woke up this morning and my iPhone is failing to connect to my home WiFi network (Uverse through a 2WIRE 3800HGV-B router, WPA Personal security). My Macbook and my wife's iPhone are still connecting without any problems, so I know the network is good. I've tried reentering the password; rebooting the iPhone; and turning WiFi off, forgetting the network and building the connection anew, but no dice. I also made sure the iPhone's software was up to date (it was). Haven't had a chance to try any other WiFi networks yet.
Any ideas?
Thanks,
Nate

Tried #1; didn't work. As for #2, since I synced after this began, wouldn't that just restore that last backup and thus be ineffective? And for #3, what's the best way to do so and then restore everything I want to keep (accounts, pics, etc)? (I don't want to try any of these more drastic measures before having a chance to see if the iPhone connects to other known networks, hopefully Monday or Tuesday I'll be near some).
As for the router/MAC thing, this iPhone has worked on this network without problem for five months, since I first set it up. There have been no changes to any part of the configuration.
Thanks,
Nate

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Look at iOS Troubleshooting Wi-Fi networks and connections http://support.apple.com/kb/TS1398
iPad: Issues connecting to Wi-Fi networks http://support.apple.com/kb/ts3304
Additional things to try.
Try this first. Turn Off your iPad. Then turn Off (disconnect power cord) the wireless router & then back On. Now boot your iPad. Hopefully it will see the WiFi.
Change the channel on your wireless router. Instructions at http://macintoshhowto.com/advanced/how-to-get-a-good-range-on-your-wireless-netw ork.html
How to Quickly Fix iPad 3 Wi-Fi Reception Problems
http://osxdaily.com/2012/03/21/fix-new-ipad-3-wi-fi-reception-problems/
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iPad Wi-Fi Problems: Comprehensive List of Fixes
http://appletoolbox.com/2010/04/ipad-wi-fi-problems-comprehensive-list-of-fixes/
Fix iPad Wifi Connection and Signal Issues http://www.youtube.com/watch?v=uwWtIG5jUxE
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