Your iPhone or iPod touch may experience one of the following symptoms:

Multi-Touch display (or touchscreen) does not respond
Portions of the Multi-Touch display do not respond
Multi-Touch display is very slow to respond

This article gives an overview of how to set up iPhone or iPod touch to sync with your computer, and where to get additional information.
When you connect iPhone or iPod touch to your computer, items are automatically synced according to your preferences set in iTunes. You can, for example, enter phone numbers and addresses of friends and family members on your computer, connect iPhone or iPod touch to sync, then unplug iPhone or iPod touch and tap a friend’s name on the touchscreen to call.
You can sync

Contacts—names, phone numbers, addresses, email addresses, and so on
Calendars—appointments and events
Notes (sync with Mac OS X Mail or Microsoft Outlook)*
Web bookmarks
Music and audiobooks
Photos
Podcasts
Movies and TV shows
Applications
Ringtones (iPhone only)
iTunes U content

* Syncing is over USB only and on a Mac requires Mac OS X 10.5.7 or later.
You only need to set which items are synced in iTunes on your computer once. After that, just connect iPhone or iPod touch to start a sync.
Contacts, calendars, notes, and bookmarks are synced from (or to) your computer, so if you add, change, or delete them on iPhone or iPod touch, they are changed on your computer, and vice versa. You can also sync contacts with your Yahoo! or Google Address Book.
Email account settings (on iPhone only), music, movies, TV shows, podcasts, and photos are synced one-way, from your computer to iPhone (though you can import photos taken with iPhone to your computer).
If you like, you can set iPhone or iPod touch to sync with only a portion of what’s on your computer. For example, you might want to sync only a group of contacts from your address book, or you may want to sync only songs from certain playlists so you don’t fill up iPhone or iPod touch with all your music.

When Microsoft Exchange mail is configured on iPhone or iPod touch, the default setting for "Mail days to sync" is set to 3 days.

When you visit me.com via Safari on an iPhone or iPod touch, the experience is different than when you use a web browser on a computer.

iTunes includes several options to automatically or manually sync music to your iPhone, iPod, iPod classic, iPod nano, iPod shuffle (3rd generation), iPod mini or iPod touch. If you are using an iPod shuffle, learn how to sync music to it in this article.