What is necessary for performing an iOS software update?

To perform an iOS software update, an internet connection is essential. This connection allows the device to access Apple's servers to download the latest software version. Updates can include important security patches and new features, so having a reliable internet connection is a fundamental requirement.

While a compatible iPhone device and being connected to a power source may be helpful and often recommended practice for ensuring the update occurs smoothly, they are not strictly necessary for the update process itself. You can initiate and download updates on a compatible device without being plugged into a power source, although it is safer to do so to prevent battery drain during the update. A Mac device with the latest version is not required to update iOS directly on an iPhone, as the update can optionally be performed over the air using the Wi-Fi connection.