Since the events of last week involving Yahoo, my iPhone 4s will not fetch mail over 3G. It tells me either my username or my password is wrong.
There is no problem over wi-fi, with the same username and password.
There is no problem accessing the internet with either 3G or wi-fi.
I changed both password and username via Settings to no avail.
Helpdesk not much help - probably too preoccupied restoring service to other users.
Anyone got any ideas what is going on?