After the number is synchronized, the SMS will also be synchronized.

When two iphones are synchronized to the same address book and information, not both parties can receive the same information and phone number, because the numbers of the two mobile phones are different.

Of course, FaceTime

Telephone and iMessage

If the information comes from the same apple,

Proof of identity

Account number may be received at the same time.

Including FaceTime.

The telephone needs good network support.