Until yesterday, for example, userscould just re-downloadsongsthey purchasedfrom the service (quite useful when your hard drive or MP3 player dies on you).
Most cell phone handsets come with a game or two built into the system, but they're usually pretty low-tech or limited in scope, so serious gamers usually download their own.
All models have the ability to upgrade to Garmin navigation via a special app (available on the Apple iTunes Store), which downloads the mapping database directly onto an iPhone 4 or 4s and allows for instantaneous routing and re-routing without the need for continuous 3G, 4G or LTE service, avoiding long download times and high data charges.