I just recently upgraded my iPhone 6 to an iPhone X. I backed up my iPhone 6 into iTunes and then restored my iPhone X with this information, however when I did this, some of my contacts did not transfer into my iPhone X- all my text messages showed up with the individuals phone numbers instead of their contact info. Once I synced/downloaded my employers software program that allows me to access my work email, all my contacts were visible. How can I transfer all the information I have in my contacts (as it is right now) to my SIM?