Yahoo email not working

[VBP2004EP3]

On my phone I have 2 Yahoo accounts and 1 AOL, yesterday morning when I woke up I opened my email to see if I had any emails and I didn't have any on my yahoo accounts but it connected and at the bottom of the email app it said the date and time. A few hours later i checked and when I opened one of the Yahoo acounts it said Cannot Get Mail "The user name or password for "[email protected]" is incorrect." but its not incorrect, I put it on my brothers iphone and worked, he put his on mine and same message... This has been working since forever wihtout a problem, I didnt change my password or anything... I can log into yahoo from my computer and so can he.... How do I fix this, I really dont want to have to restore... I am on Tmobile FW2.2 and I was connected to wifi all the times i was trying this