You need to be able to connect to the Internet to take advantage of most iPhone 4S features, which you can do using a Wi-Fi network or 3G from your cellular provider or by syncing from your computer. You might want to have a computer so that you can download photos, videos, music, or applications and transfer them to your iPhone through syncing.

With iOS 5, a new Apple service called iCloud has arrived, which syncs content from all your Apple iOS devices so anything you buy on your iPad, for example, will automatically be pushed to your iPhone.

Your phone will probably arrive registered and activated or, if you buy it in a store, the person helping you can handle that procedure.

For an iPhone 4S, Apple’s iPhone User Guide recommends that you have

  • A Mac or PC with a USB 2.0 port and one of these operating systems:

    • Mac OS X Lion version 10.7.2 or later

    • Windows 7or Windows Vista

  • iTunes 10.5 or later

  • An iTunes Store account

  • Internet access

Apple has set up its iTunes software to help you manage content for your iPhone — which includes the movies, music, or photos you’ve downloaded — and specify from where to transfer your calendar and contact information.