I am trying to access my email on my Cingular phone - Yahoo keeps saying that the login is incorrect...?

The help screen says that the letters might be unknowingly caps, but this is not the case either... what should I do? I have the Nokia E62 and Nokia 6061 that give the same message

I am trying to access my email on my Cingular phone - Yahoo keeps saying that the login is incorrect...?
I don't have the answer 'cause I'm waiting on my E62, but I suggest you call Cingular support first. If need be contact Yahoo support after that.