Could someone KINDLY EXPLAINS push email with yahoo? THANK YOU

Question

Trying to understand push email with yahoo because some have it working, some do not, some partially.
If you are on ATT
1) Do you get push email when you phone is locked? (Does it beep or vibrate?)
2) Does it show you that you have new email on your wallpaper similar to how you get voicemails?
3) Can you get push email over the EDGE network or just WIFI?
4) I noticed that my email push isnt working, but whenever I unlock the phone, it seems to do a manual check, is this true? (I.E. If I leave the phone unlocked for hours it will not have the red text next to my mail icon, but if I lock->unlock, it instantly shows
If you are on non ATT network, will any form of push email work at all?
THANK YOU, any information appreciated.

Answer 1

1) Do you get push email when you phone is locked? (Does it beep or vibrate?)
-It does both for me.
2) Does it show you that you have new email on your wallpaper similar to how you get voicemails?
-The "Unread" count is displayed/updated on the icon on the home screen. It does not display a box overlay like missed calls or voicemail. I just hear/feel the beep and have to unlock the phone to see what happened.
3) Can you get push email over the EDGE network or just WIFI?
-EDGE works when WiFi is OFF.
4) ...whenever I unlock the phone, it seems to do a manual check, is this true?
-I hadn't noticed that. It does seem to manually check when I go to the Mail app.
My impression is that Push seems to be a little more reliable since 1.1.1, but I haven't tested it rigorously.
Hope this helps,
-Peter