digitaldivide: Can you check if something else can connect over Wifi to the D-G604T (a laptop or similar), with the password?
Can you confirm on your iPhone, you "Reset Network Settings", as part of your troubleshooting.
Me.
And I meant to add
* Make sure the secret password you loaded onto your D-G604T router under "WPA" is all lower case, and when entering it into your iPhone is all lower case
* When troubleshooting and connecting/reconnecting/trying again, on your iPhone, navigate to your list of Wifi networks, force it to "Forget your Wifi network", then go find your network SSID, and enter the wifi password to authenticate (i.e: start afresh)
* A soft-boot goes along way on the D-G604T, just check after rebooting that all your settings are correct as you expect them
I feel your pain dude. I had the exact same issue with my 3G and a Belkin router. The Belkin Router sucks arse (it is giving my PS3 all sorts of wireless issues) but I don't think it is the sole issue.
Reason being is now that I have an iPhone 4 I can connect to wifi with the same router with no issues and it never drops.
I gave my 3G to my partner and did a full reset before doing so. The problem still exists on the 3G. You will unlock the phone and it will be in wifi for 30sec or so then drop the connection and ask for a password. You put that in, it connects and it drops it seconds later. Rinse and repeat. Stupid.
IMO I think it is a mix of a crummy router (in my case a Belkin N+) and the phone. I will also add my previous dlink router never gave the 3G any issues. I think it is the hardware combination.
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