Posted 29 May 2013 - 00:58
What have you tried?
Rebooting might resolve the issue.
Toggling between PUSH and polling and back again may resolve the issue.
Removing the GMail Exchange account and then re-adding it may resolve the issue.
If you can send emails to your gmail from another account for testing, it may help you resolve the issue further.
From what I know, push should still work fine if your device had been "on" their ActiveSync server since before they stopped accepting new devices (as you seem to already know and understand yourself). If I understand correctly, new devices can't even connect to the ActiveSync server. New devices can only connect via POP3 and IMAP. So the fact that you can still access your email through that protocol is a good sign.
Eventually you will have to upgrade your phone to something and ActiveSync Gmail will no longer be available to you. Have you tried the Gmail App or the various 3rd party apps such as MailBox? If you plan to stick with iPhone for your next iPhone, want to stick with Google Gmail, and you require PUSH notifications then you will eventually have to use the GMail app or a 3rd party mail client that supports PUSH with Gmail.