Two Apple phones use the same id, how to synchronize SMS?

After setting up, both phones can receive it. The method is as follows:

1, open imessage in the settings and you will receive it;

2. Two Apple phones use the same ID. If it is not set, two SMS messages cannot be received.

3. You can check whether iCloud is enabled. When two people use the same ID, if iCloud is enabled, they will receive information and other materials sent by the other party, and the information and photos can be synchronized; You don't need this function to set where to close. When turned on, the functions will be relatively synchronized. Opening icloud is equivalent to opening the network cloud disk.