Yes, an iPhone can work without iCloud. While iCloud offers various features such as data backup, synchronization of photos, contacts, calendar events, and access to services like Find My iPhone, it is not mandatory for the basic functionality of the device. Users can still use their iPhone for calls, texts, browsing the internet, downloading apps, and other activities without an iCloud account.
However, some features may require an iCloud account or similar alternatives. For example, to back up your device, you would need to connect it to a computer and use iTunes or Finder instead of using iCloud. If you choose not to use iCloud, you can manage your data and files via other services such as Google Drive, Dropbox, or by manually transferring files.