With the introduction of iOS 5 and iCloud, it is possible to use your iPhone and iPad without owning a Mac or PC. In iOS 5, a number of features are introduced to fulfill the “Post PC” era of iDevices.
Activate from within device. Instead of having to plug your iPhone, iPod touch or iPad into an iTunes running Mac or PC to activate the device, iOS 5 allows you to activate directly from within the device.
OTA (Over-The-Air) Software Update. OTA Software Update will make it possible to update iOS system software wirelessly. When Apple release a new update let say iOS 5.1, just go to Settings > Software Update to upgrade. No iTunes and Mac/PC required. Apple implements delta update mechanism. Instead of the whole iOS, you only download what’s changed, which significantly reduced the size of the update.
Purchased apps, music and books in the cloud. Apps, music and books that you purchased from the iTunes store are now in iCloud. You can re-download them into your iDevice without relying on iTunes backup.
Backup to iCloud. When you enable backup to iCloud, it backs up daily over Wi-Fi your photos and video in the camera roll, device settings, app data, home screen and app organization, ringtones and text/MMS messages. This backup can be used to restore your phone data and settings such as when changing a new phone.