What must be done to transfer data from an old iPhone to a new one?

To successfully transfer data from an old iPhone to a new one, selecting 'Set Up as New' or 'Restore from Backup' during the setup process is essential. This choice directs the new device on how to acquire the data, allowing users to choose whether to set it up with fresh settings or to restore everything from a previous backup.

Using the 'Restore from Backup' option ensures that all data, such as photos, apps, settings, and messages, is seamlessly transferred from the older device, which is crucial for maintaining user experience and continuity across devices. The 'Set Up as New' option is useful for those who wish to start with a clean slate.

The other options are limited in scope. Direct cable connection can streamline the process but isn’t the only method available, as wireless transfers via iCloud and iTunes are also supported. Resetting the old iPhone is unnecessary for data transfer and could lead to loss of information if not done judiciously. Transferring only contacts via iCloud restricts the user to just a fraction of their data, which is not comprehensive enough for a full device transition.

Thus, the correct choice effectively captures the complete method for transferring data between iPhones.