WiFi Dropping On and Off

I got my 3g iPhone over the weekend, and have had trouble staying connected to WiFi networks. I've tested on three different WiFi networks and had the same results:
1. iPhone takes awhile (maybe a minute or so) to find the network in order to sign on initially.
2. iPhone often does not show full strength on the WiFi signal indicator, even when I am within 5-10 feet of the wireless router, with nothing between iPhone and router.
3. iPhone will lose WiFi connection within 1-3 minutes, and periodically pick it up again, dropping on and off with no perceivable rhyme or reason. This happens at very close distances to the router, and farther away (25-50ft.), and it happens without moving the iPhone...sitting on a table or desk, it will just drop WiFi and pick it up.
Anyone have any thoughts on this? Thanks.

Trey Miller wrote:
I am open to changing the channel on the wireless network, but given the zero-distance scenario above, >isn't it safe to rule out interference?
No. The devices described in the article above can still cause interference.
Is there any chance this is an iPhone hardware issue? If so, what are my potential remedies, given that I >bought it less >than a week ago? It seems unlikely to me, but I hate beating my head against the wall >unnecessarily.
This does not sound like a hardware issue with the iPhone but, if you believe it is, you can make a reservation to see a Mac Genius. The Mac Genius can take a look at the iPhone and test it with the open Wi-Fi network at the Apple retail store.
http://www.apple.com/retail/geniusbar/
I recommend restoring the iPhone to rule out software issues.
http://docs.info.apple.com/article.html?artnum=305744
Make sure the wireless router has the latest firmware updates available. Also, try to hard reset the router to factory default settings and reconfigure it.
Jason

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Infact, my problem is not only with iOS 6 and iPhone. I also have the same problem with my MacBook (2009, OSX Mountain Lion 10.8.2) and also my iPad 2 on iOS 6.0.1.
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