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[dm33]

Did you replace the router after you updated your iPhone to 3.1.2 or 3.1 for that matter?  3.1.2 just came out a week or two ago.   One thing that you could try as it fixed some other network related things is to reset the iPhone's network settings and rejoin your wireless network.  I know you said you tried the different cyper options and such, but it may be worth a try.

General -> Reset -> Reset Network Settings
then redo your wifi config with the "best" cypher options you can ( WPA2, AES ).  works fine on my 655 and I know that iPhone OS 3.1+ had some issues with wifi for some people until they fully cleared the network settings.

I had updated to iPhone fw 3.1.2 when it came out. I hadn't noticed any problems. I just bought the DIR-825 a couple of days ago.

I have not tried resetting network settings. Are you saying that you're successfully using your DIR-655 with an iPhone running 3.1.2 with WPA2/AES?

Latest things I've tried...
I'm setup the guest network on the DIR-825. Confirmed that it still fails with WPA2/AES.
If I turn off security completely... it seems to work fine. Did not experience a problem.
Now I've turned on 128bit WEP and so far so good, no problems.

This looks like it narrows the problem to WPA/WPA2 negotiation with the iPhone 3.1.2.

Update: I tried resetting network settings on the iPhone and connected to my network as auto WPA/WPA2, TKIP and AES. It failed after a while. I therefore have no reason to believe that resetting network settings helps.

The only thing I've found to work (so far) is either disabling security completely or using WEP.

[TheAncientEvil]

I don't remember what the specific setting is, I'll have to drop and rejoin but my DIR-655 is set to allow WPA or WPA2 and set to allow TKIP and AES and my iPhone 3.1.2 does not drop its connection.   I do some streaming video development for the iphone which runs for quite a while in my testing so I would know if it dropped out. 

My DIR-655 is an A1 running FW 1.10 if that helps.

[DCIFRTHS]

... I have not tried resetting network settings. Are you saying that you're successfully using your DIR-655 with an iPhone running 3.1.2 with WPA2/AES? ...

I can say that. I have been using my iPhone 3G with the DIR-655 for approximately 8 moths. I don't ever recall having a problem. I'm at version 1.21 on the DIR-655 A3, and 3.12 on the iPhone. I wish that I had something to offer as a suggestion, but I have not had a problem with these settings.

[Lycan]

I own a 3G iPhone as well and do not have issues with it connecting to any D-Link router.
I suggest having your phone looked at by Apple.

[TheAncientEvil]

I just made the could be fatal move of buying a DGL-4500, I just hooked it up, but I'll report after using it for a bit if i see the wireless disconnects you are talking about with your DIR-655.

[dm33]

I can say that. I have been using my iPhone 3G with the DIR-655 for approximately 8 moths. I don't ever recall having a problem. I'm at version 1.21 on the DIR-655 A3, and 3.12 on the iPhone. I wish that I had something to offer as a suggestion, but I have not had a problem with these settings.

I verified again last night. Even resetting network settings on the iPhone, configure DIR-825 to WPA2/AES g&n, still complains about "incorrect wifi password" after a while.

Does that mean that the problem originally reported on this thread no longer exists with DIR-655? If so, maybe its a problem unique to the DIR-825.

[lizzi555]

Or perhaps it is a firmware problem of iPhone ?

http://discussions.apple.com/thread.jspa?threadID=2044754&tstart=0

When I read this, I decided to wait buying the new iPhone, allthough I'm very curious.