How to Activate Push Yahoo on an iPhoneby Ashley Donohoe
The iPhone supports push notifications that display alerts when specific events occur. In addition, the service pushes new email, calendar updates and notes to your phone, which can help keep your device synced with your latest data. The iPhone currently supports MobileMe, Yahoo! and Microsoft Exchange accounts for the push service and lets you specify how often you want data pushed to your phone.
Tap "Settings" on your iPhone's home screen and select "Mail, Contacts, Calendars." Tap "Add Account" under "Accounts" and tap "Yahoo!" on the list of providers.
Type your name, email address, password and description on the account setup screen and tap "Next" to verify the account.
Tap "On" next to "Mail" and next to "Calendars" and "Notes" if you want to sync them as well. Tap "Save" to save your account settings and to return to your list of accounts.
Tap "Fetch New Data" under your list of accounts and tap "On" next to "Push." Tap "Advanced" at the bottom of the screen and tap "Yahoo!" Tap "Push" to activate push for your Yahoo! account if it is not already enabled.