How do you set the settings for the yahoo mail push or AOL or Gmail on the iPhone?
You have to make sure that on your email settings from your Gmail or AOL accounts are set to enable POP or IMAP to forward mail to your phone. Yahoo is automatic. If your email accounts didn't sync during your activation process than just set them up on your phone. (You do have existing email accounts, right?) If so, all you do is go to:
Settings
Mail
Add Account...
Choose either on you're setting up (Y!, Gmail, AOL, etc)
Fill in blanks from there...
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