I have upgraded my Iphone (Not 3G...yet) and my SBC Yahoo e-mail is not being "pushed" as it should be. Sometimes it's immediate sometimes I have to manaully refresh. This occurs regardless of WiFi or EDGE.
My sbcglobal account does a half assed push type thing. Sometimes it pushes, sometimes it doesn't. It's been like this since day one of the iPhone 2G, except for those few days when it wouldn't update at all.
Since I've upgraded to 2.0 my email hasn't been working as smooth as before. Yahoo Push doesn't seem to work if my iphone is just in standby, but if I'm using the iphone it works. I'll go back in from standby and I'll still see emails I've deleted using my computer.
My Free Ymail push drains my battery so much! And I rarely get emails on it. I wanted to use it for SMS like communication, but it embeds pictures in such a way that I can't send MMS with it and I have to do MMS with Gmail. It kinda sucks...