MobileMe: Troubleshooting Push with MobileMe Mail on an iPhone, iPad, or iPod touch

Resolution

1. Make sure you have access to the Internet: Open Safari on your iPhone, iPad, or iPod touch, and make sure you can load a webpage, such as www.apple.com.
2. Verify that you can receive email for your MobileMe account on your Mac or PC; for example, in Mac OS X open Mail and make sure you are able to receive messages as expected.
3. Make sure that your MobileMe mail account is enabled, Push is enabled on your device, and Push is enabled for your account:

Collapse All Sections | Expand All Sections

Ensure mail is enabled for your account

Ensure Push is enabled on your iPhone, iPad, or iPod touch

Ensure Push is selected for your MobileMe account's mail

4. Turn your device off and on, and then try again.
5. If the issue persists, turn off all the sliders mentioned about in step 3, then turn them back on again and try again.
6. If you have multiple MobileMe accounts set up on your device, Push will only work for one account.  If you want to switch which account uses Push, you will need to turn on contact, calendars, or bookmark syncing for that account, then enable Push.
7. If you have iOS 4.1, confirm your device is successfully connected to MobileMe by using Find My iPhone to see if your device is online. If it isn't online, there may be a broader MobileMe notifications service disruption. Check the System Status on the MobileMe Support web site.
8. If the other steps do not help, delete the account from your device.  From the Home screen, tap Settings > Mail, Contacts, and Calendars, and then tap your MobileMe account (if syncing Contacts, Calendar, or Bookmark data with MobileMe, choose to keep the data on your iPhone/iPad/iPod touch when prompted). Tap Delete Account. On the Mail, Contacts, and Calendars screen, tap Add Account > MobileMe, and set up your account again. If you are syncing data with MobileMe on your device, choose to Merge data on your device when prompted to do so after adding your account.