I have two iPhone. My contacts are always synchronized recently. How to cancel the synchronization of call records?

You can cancel the synchronization of call records by turning off Icloud backup.

Closing method:

1. Click Settings.

2. click icloud.

3. click icloud backup.

4. Finish canceling synchronization.

Call record: refers to all kinds of information recorded in the operator's switch, such as calling call, called call, calling short message, called short message and roaming call initiated by fixed telephone users and mobile telephone users. Call records provide a basis for operators to charge fees, and also provide a basis for users to verify their calls.