Cannot turn off fetch or push after 3.0 update

Question

I noticed that my 3G data usage is increasing even if I didn't use my phone outside WiFi coverage. And I kept getting new emails even I didn't open my email application. I turned off push and fetch new data for both of my Gmail and Yahoo account, and set them to "manual" in "fetch new data"->"advanced". I still get new email notification automatically. I wonder it is a 3.0 bug. I have no data plan with my carrier, so this bug is really killing my wallet....

Answer 1

I have discovered something interesting from another, related forum discussion. This person was told that it had to do with using 3G rather than the Edge network and something about poplock.
This was happening to me on both pop and imap accounts but I thought that I would try to switch to Edge to see if that solved the problem of getting emails pushed when I made phone calls, even though I had all of my settings for push and fetch off.
Well, when I switched to Edge, I did not receive emails when I made calls so that was very interesting. Then, I decided to switch back to 3G and I am still not receiving emails when I make phone calls so that is promising.
My guess was that when I turned the phone off and on, it would revert back to getting emails pushed when I made phone calls, if I used the 3G network. Surprisingly, it didn't revert back and I still didn't get emails pushed. Had to go into mail and then, they were there, just like it used to work.
Will see how long this lasts and keep this post updated.
So, for those who do not want emails pushed, try switching to Edge network for a few minutes. Then, switch back to 3G to see if this works for you.