My home wi-fi network no longer recognized by Iphone 4

Ever since I got my iPhone 4, it has worked fine with my home wi-fi network which is hosted on an Airport Extreme. Today it started dropping the network and now won't find it at all, or any of the other networks close by me. My iPad, MacBook and a PC laptop all find the network with no problem.
When I take the iPhone to other wi-fi connections nearby, it finds them and connects just fine.
I have turned the phone on & off several times, reset 'Network Settings' several times, turned the Airport Extreme off & on, all to no avail. I haven't added any new wireless phones or other electrical equipment to the house. I haven't tried a complete reset and restore of he phone as yet.
Could another router or electrical equipment nearby be causing a problem?

Sorry Linda: poor sentence construction on my part; we have different SSIDs!
Anyway, the issue isn't 'ravin' - they're back on line and no problem. I'm on channel 11 and no problem since yesterday morning. This did happen once before, some time ago, but it affected my whole wf-fi system, not just the iPhones. Again, it lasted about a day and then mysteriously disappeared. I do live in an area where construction is going on; maybe a piece of equipment is occasionally used which causes interference???
Probably one of those mysteries that will never be solved!

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