Does Apple's mobile phone id synchronize with SMS?

Yes, it will be synchronized. If two phones use the same id, both phones can see SMS.

Main functions of iCloud: automatic backup, cloud documents, cloud photos, cloud iTunes, 5 GB space, free mobile Me mailbox, and one more thing.

iCloud[ai][kla？ D] is a cloud service provided by Apple, which allows users to store 5GB of data for free. On 2011May 3 1 day, Apple officially announced that it owns iCloud products for the first time. Apple claims that iCloud will replace MobileMe. iCloud is completely rewritten on the basis of the original MobileMe function, providing the original mail, calendar and contact synchronization functions.