Is there a difference between saving a message on a mobile phone and saving it on a card?

Save it on your mobile phone, and the short message content will be with your mobile phone. Without a cell phone, you can't see.

Save it on the SIM card. Without the SIM card, the mobile phone can't see this information.

So although the storage location is different, it is essentially the same.

Users can choose the third-party short message backup, as long as users are in the network state, they can restore the short message content anytime and anywhere without any interference. General mobile phone security assistants have this backup requirement, and users can download it themselves.