11-14-2013 06:25 PM
12-01-2013 11:21 AM
Recently someone else had the same problem as you with Yahoo, I suggested to change the password.
They changed the password this way and it worked.
Remove your Yahoo account from your phone, power off your phone. Access your Yahoo account on the web and change the password, Wait a while then power on your phone and add your Yahoo account.
12-01-2013 05:22 PM
Here is a similar issue like yours, you will see it was resolved, the user writes that Yahoo changed the password requirements.
I hope this helps !