The SanDisk Memory Zone app can be used on the iPhone to back up and manage personal data such as contacts and photos. It supports automatic synchronisation of this data with compatible SanDisk devices, including external SSDs such as the Extreme Portable (2000 GB). However, there is no specific information on whether the app enables automatic synchronisation with iPhones, as the app is mainly aimed at backing up and managing data on SanDisk devices.