Suddenly my Iphone 4 won't connect to router

Hi,
I've had my Iphone 4 about three weeks and it has been connecting fine to my D-LINK router. This morning it wouldn't connect. I was asked to put in my password and the phone keeps returning that the password is wrong (it isn't!). My laptop is connecting fine. I've tried rebooting the router to no avail. Anyone have any suggestions?
Thanks!

What OS version are you using 4.0.1 or 4.0.2? Did you upgrade just before this started?
Go to Setting>General>About and at the bottom should be the version.

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Please read this :
https://discussions.apple.com/message/20053332?ac_cid=tw123456#20053332
Well I copyed it to you here.
Re: Anyone still having IOS 6 wifi issues?
created by mpa9366 in Using iPad - View the full discussion
Having done a lot of reading today and having found a very good online tablet magazine (will post link tomorrow) there seems to be a few tech bods onto the problem.
The magazine I was reading identified wifi problems within hours of the ios 6 release and have been analysing since then with almost daily updates - the story seems to be:
The apple authenthication transmission is normal, it should slip through event prior to a full handshake with the host network being completed - however if not authenthicated then apple will not permit the device to connect (kills the connection) this is designed to protect apple from counterfeiting. So thats problem 1 if you dont receive a token from apple.
Problem 2 is that ios 6 only supports ipv6 (the new ip protocol) whereas outside silicon valley a large proportion of routers modems etc are still ipv4 protocol.
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A very basic expectation would have been dual protocol handling - we know the HW supports ipv4 as all wad fine on ios5.
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Only apple can fix this with a patch to enable ipv4 protocol handling.
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