There is always a small circle in the upper left corner of the Iphone.

When there is a small circle in the upper left corner of the Iphone, it means that the synchronization function is turned on. When this icon appears, it means that the phone is synchronizing with Apple's ICloud, and your phone's photos, contacts, text messages and other data are synchronized to the cloud for backup.

ICloud organically combines Apple's music service, system backup, file transfer, notebook and tablet product lines, and they are closely related. ICloud is a service platform different from previous cloud computing. The server provided by Apple should not only be a simple storage medium, but also bring more new experiences to users.

Extended data:

ICloud is a private cloud space provided by Apple for Apple users, which is convenient for Apple users to share personal data between different devices. ICloud supports user devices to push data wirelessly, which is simpler than Apple's traditional iTunes solution (which requires a data cable connection) and has a better user experience.

The iCloud platform can store your personal information in Apple's server. By connecting to the wireless network, this information will be automatically pushed to every device in your hand, including iPhone, iPod Touch, iPad and even Mac computer.

MobileMe is a typical representative under the iCloud platform. Jobs said that in the past, Apple has optimized MobileMe many times, and contacts, calendars, emails and other contents will be automatically synchronized to the cloud, so users can share these contents with other iOS or Mac OS devices anytime and anywhere.

References:

Icloud_ Baidu Encyclopedia