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Can Apple use two cards to exchange information in turn?

Apple's mobile phone uses two cards in turn to exchange text messages on the mobile phone, which will not disappear.

In fact, Apple has a very good function, which is to use the same Apple ID number to enable iMessage? SMS switching, so that if two mobile phones use the same Apple ID number, iMessage SMS will be enjoyed by * * * *.

The following figure shows that the iMessage switch is off.

The figure below shows the open state of iMessage.