Yahoo Sign in problem


New Email
M trying to sign in my yahoo account (mail & messenger) on mobile but m looped back on sign in page with a note that "We're sorry that you are having difficulty logging in. Please sign in from our desktop screen and then try login again from mobile login screen"
I have tried this but no use.

I have as well tried various options like deleting cookies, sign in using alternate id, clicking on yahoo help link. I've as well downloaded opera again on mobile. Switched my mobile off removing sim and batter. but no luck

The issue is not with password as am able to login on PC. Please suggest what should be done