What data will two iphone synchronize with the same id?

A lot of data will be synchronized with the same ID, but it can be turned off in the settings, so it will not be synchronized.

The following information will be synchronized:

1, the phone book will be synchronized.

2. Call records will be synchronized.

3, SMS content synchronization

4. the content in 4.facetime will also be synchronized.

5. The downloaded software will be downloaded synchronously.

All of the above can be turned off in the settings, and will not be synchronized after turning off.