[garypggg]

how come on the yahoo mail setting, download new content, the fastest you can set it is every 15 minutes, however google mail you can set it as items arrive? is there a fix for this so i can get yahoo mail as items arrive? thanks!

[DarkUltra]

There was an issue with Yahoo and imap push causing excessive data usage
Yahoo confirmed culprit in Windows Phone data usage overages Within Windows

Yahoo has fixed this bug
Yahoo fixes their implementation of IMAP, finally Within Windows

But that was a year ago and, as you, I can still not enable push/as items arrive for Yahoo mail! Here you can vote "me too" on this issue:
Push email for Yahoo and godaddy - Microsoft Answers