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Want to sync your iPhone contacts and calendars with those on your computer?

1. Connect your iPhone to your Mac or PC. iTunes will open up. Once your iPhone appears in the Devices list, click on it, then click on the Info tab in the main window. Choose how to sync your info. If you don’t use MobileMe, you’re done for now.
2. MobileMe requires more setting up. Armed with your username and password, sync your PC or Mac data with MobileMe. On a Mac, go to System Preferences > MobileMe (or .Mac on older systems). If you’re using PC, you’ll find MobileMe preferences in Control Panel.
3. Once your account is all set up, it’s easy to sync data between your iPhone and your MobileMe account on your computer. On your iPhone, tap on Settings from the Home screen. Make sure the Fetch New Data option is set to Push. Then in Mail, Contacts, Calendars tap on Add Account and add your MobileMe account details if you haven’t done so already.
4. Click on your MobileMe account in Settings > Mail, Contacts, Calendars then ensure all the sliders are set to On. Be aware that this will overwrite the contact and calendars already on your iPhone, so make sure you followed step number two.