Iphone wifi no longer works with one type of router...

Hello all,
I have been looking at other posts but have not found any resolution. My iphone 3g has always worked on my home wifi but stopped two weeks ago or so. It works fine on other peoples routers and my imac and powerbook pick up the wifi fine.
I found that other people using the wcg200 gateway modem/router with comcast are all of the sudden having the same issue.
Does anyone know of a fix? I hate to think we all have to go out and purchase a new piece of equipment when it was working fine for so long. Any help would be great.
Thanks in advance

Thanks for the tips! I tried it all but none of it worked.
It seems to be everyone with a wcg200 can't get wifi to work. I have had the phone
for 6 months now and it worked great till about 2 weeks ago or so. Nothing seems to work. Again,
it works fine with other peoples wifi and my other computers work fine with it.
Maybe someone can make this a pet project. I read that comcast updated the ROM on this model without telling us. If that caused it, can anyone think of how to make it work again? I am lost and I hate to have to buy a new modem/router if there is a way to fix this issue.
Thanks again

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