How does Apple 5S read the SMS of sim card? Or imported from a sim card. Not a phone book. I am Unicom.

At present, Apple 5S can't directly read the information on the SIM card, so it can use the SIM card reader to import the Apple mobile phone.

SIM card reader is a kind of hardware interface circuit for reading the internal information of SIM card, which is similar to the card readers of various memory cards you usually see. You can read the phone book, short messages and other information in the SIM card, and complete the modification of the phone book, thus backing up the phone book.