Recently (last two weeks) I've been having trouble receiving push email on my iphone 4s. I normally use yahoo but tried using gmail and even that wouldn't push to my phone. As well, when I set the phone to fetch my emails it doesn't load any new emails until I open the mail app. I've tried deleted and readding the email accounts in addition to restarting the iphone, but it still doesn't make a difference if I'm on wifi or 3g. Any insight? Thanks!